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This film can't make up its mind if it wants to be a featherweight romantic comedy or a Seven/Silence of the Lambs-style dark thriller.

Without any funny jokes or a credible or even remotely interesting villain it succeeds as neither. Add an unthinkably daft twist ending and you end up with a very confused mess. If it's creepy, it's not in a good way - the creepiness lies in trying to figure out how Johnny To could possibly think it a good idea to put a subplot about a cannibal serial killer of young women in a slapstick romantic comedy.

It's possible something got lost in translation, but I really can't imagine what kind of cultural insight would make this make sense.

'Blind Detective's' pedigree reads like a match made in cinematic heaven - on one hand, it boasts the reunion of Hong Kong's golden screen couple, Andy Lau and Sammi Cheng, after almost a decade; on the other, its creative team made up of Johnnie To and Wai Kar Fai is arguably one of the most successful partnerships in the Hong Kong film industry. Yet it is precisely because of the latter reason that one should know better than to expect a conventional movie - after all, neither To nor Wai have ever liked to be associated with just perfunctory.

And 'Blind Detective' bears that similarly uncharacteristic trait, defying easy genre characterisation by treading right on the middle line between a slapstick rom-com and a crime thriller. It is a very fine balance no doubt, one that proves too tricky from time to time even for a director of auteur status like To, so criticism that the movie is tonally all over the place is somewhat not unfounded. That doesn't mean however that it isn't entertaining; on the contrary, it pulses with its own eccentric beat, and the more you get used to its offbeat tone, the faster you'll begin to appreciate its own unique charm.

To introduces us and his odd couple to each other with an acid attack case that both Lau's retinally-damaged former top cop Johnston and Cheng's junior crime squad cop Ho are on the trail of. Turns out that since losing his sight four years earlier, Johnston has been using his other senses and formidable deductive powers to solve crimes solely for the purpose of earning the associated bounties. Having made acquaintance, Ho engages Johnston to do a little sleuthing for her - more specifically, to assist her in finding a childhood friend with a tragic past called Minnie who disappeared many years ago. Under the guise of working more closely with her, Johnston moves into Ho's apartment - though an earlier scene which demonstrates his solitude living alone suggests that he wants company too.

While Minnie's case frames the nature of their interaction, almost half the movie is in fact spent on other cold cases that Johnston is still chasing the bounty for - and like Ho, we too are taken on a couple of these bizarre diversions. One particularly outlandish case has Johnston attempting to piece together a murder scene in a morgue with some generous help from Ho, the re-enactments played for broader-than-broad laughs with a hammer, a motorbike helmet and a TV set thrown in. Johnston's technique is to attentively reconstruct the crime scene, which given his disability, makes Ho a useful companion to participate in these elaborate and occasionally over-the-top sequences.

At least for the middle section, Wai's script tends to meander, not least for the fact that it tries to add in some unnecessary subplots including Johnston's crush on a tango dancer (Gao Yuanyuan) and his rivalry with Szeto. Only towards the last third does Johnston get down to business on Minnie's case, the trail of clues leading them to a love triangle in Zhuhai involving a pregnant woman (Eileen Yeow) and a teppanyaki chef (Ziyi) as well as to a psychotic serial killer responsible for the deaths of several missing young women over the past few years.

Even then, those familiar with To's rigour in shooting well-detailed procedurals like this year's 'Drug War' may not be used to what appears to be a lack of storytelling discipline here. To plays it fast and loose, seemingly reluctant to exert tighter directorial rein over Wai's slackly constructed plotting; yet seen through a less critical perspective, To in fact gives as much, if not more, weight to the relationship between Johnston and Ho as to the central mystery, each of the distractions in fact deepening their quirky but no doubt romantic attraction.

Just as in most Wai films, there is a moral at the end when the truth about Minnie's disappearance is revealed, a cautionary lesson if you will about the consequences of being blinded by one's own stubbornness. Viewed through this lens, Johnston and Ho's earlier encounters gain some meaningful significance - ultimately, both Johnston and Ho have also been guilty of refusing to let go of their respective baggage from the past, and it is with each other that they learn to recognise the importance of moving on. Yet it is a point that may be lost on many audiences, who are likely to be frustrated by the alternating mix of madcap laughs and overdone acting.

Yes, while there is little doubt of the palpable chemistry between Andy Lau and Sammi Cheng, both are guilty of crossing the line into histrionics at times. Lau is arguably best during his character's quieter and more introspective moments, in particular when he visualises himself communicating with victim and suspect alike in dreamlike fashion; unfortunately, his real-life interactions tend to consist of him flailing and shouting exaggeratedly. Cheng is thankfully more subdued most of the time, and amply demonstrates her gift for physical comedy especially during the crime scene re-enactments.

It's hard to imagine any other screen couple in the roles of Johnston and Ho, which is another way of saying that the movie probably would not work with someone else in Andy and Sammi's shoes. And by virtue of that, this genre mash-up is unequivocally their show, which in the hands of Johnnie To and Wai Kar-Fai, is quite a different creature from the usual Hong Kong comedies or for that matter detective thrillers. The combination of both makes for a deliberately uncharacteristic tone that is both weird and wacky, but there is still an undeniably idiosyncratic charm about it that deserves an appreciative audience.

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Directed by Johnny To. Brilliant, hilarious and nerve wracking.

Everything gets thrown into the plot. Blind detective, betrayed by partner, teams up with a young female cop, a missing teenager, serial killers, a jilted woman, an on-screen birth, thrills and spills.

Hong Kong's Sherlock Holms. Depends on empathy rather than deduction.

As sharp as Zatoichi's blade.

Terrific performances by Andy Lau and Sammi Cheng. Strong supporting cast.

I rarely give a rating of 8/10.

This is one movie I can recommend.

Blind Detective marks the sixth time Andy Lau and Sammi Cheng have played an on screen couple. Three of them, Needing You, Love on a Diet and Yesterday Once More were all Milkyway productions. Their first collaboration in the office romantic comedy Needing You is the original blueprint of their coupling, establishing the lovable quirks of Sammi Cheng, the catchy pop theme song sung by Cheng and her charming chemistry with Andy Lau. When Andy Lau and Sammi Cheng are next to each other in a movie, it's so dripping in charm you feel like anything can happen. They can be pigging out at a restaurant, do crazy borderline illegal things or scream at each other. No wrong can be done.

In a way, that is the guide to enjoying Blind Detective. Lau and Cheng completely drive the film, not the plot or the mystery. It's a combination of Johnnie To's 2007 Mad Detective and the fourth sequel-in-spirit of Lau and Cheng Milkyway romantic comedies. In fact, having that preexisting knowledge is a requirement to understanding the film's meandering tone.

At 130 minutes, Wai Ka-Fai's script takes on more subplots than necessary. The mystery plot had me most engaged, and I liked how the crime-solving plot sprouted in multiple cases. The final reveal seemed rushed and a bit far-fetched to be truly believable. And there were details that should have been caught. The subplot with Andy Lau trying to woo a dance instructor played by Gao Yuan Yuan is cute but extraneous. It's like the filmmakers brainstormed every possible thing for Andy Lau and Sammi Cheng's characters to do, filmed all of them, and couldn't decide what to take out.

In the end, Blind Detective is a weird animal. It won't translate to overseas audiences and probably shouldn't have premiered at Cannes. It's biggest achievement is it knows its stars are the main attraction and does everything it can with them. Andy Lau seems to be relishing in this role and it's adorable how his character is a major foodie. I laughed throughout it's entirety, never really questioning where the plot was going because I knew the context. And for that, people who are familiar with Andy Lau and Sammi Cheng's coupling in Milkyway productions will have a better time.

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IThe Blind Detective was fairly hard to follow as it jump scene to scene without really giving you a full explanation. We are also exploring multiple cases at once, so sometimes it becomes rather hard to know what case we are talking about. As a result the film becomes a bit convoluted. It is fairly entertaining for what it is (a silly overdramatic Hong Kong comedy]. Andy Lau does give a great performance, not afraid to make himself look wild.

If you want just a silly film with a bit of a mystery, check it out. It's not the worst, it's not the best.