In the thick fog of a London night a man is deliberately run over by a car driven by a woman: he was Denny McMara. The police classify it as an hit-and-run accident, but the young Heather, Danny's sister - basing on her own "intuition", but lacking of evidence -, is convinced it was a murder. An American magazine writer, Philip O'Dell, mainly motivated by the sex appeal of Heather, wants to help her prove her point, though Scotland Yard's inspector Rigby warns him not to mix, as an amateur private eye, with the sound investigation routine of the police.
But O'Dell, little by little, manages to uncover a ring of 4/5 people that would have had interest in killing Danny, their motive, and even the actual murderer. The problem is that every evidence he finds happen to be destroyed before he can show it to the Yard's inspector. At the end Rigby himself congratulates with O'Dell for solving the mystery: and we don't know why, because all the members of the gang are dead, by now, so the eventual evidence in the end is as feeble as it was in the beginning.
Quite cumbersome and totally predictable film, in whose plot nothing new happens; to make it worse, the comic traits are just laughable (ironically), not amusing.
O'Dell and Heather, at the end, of course, marry, which doesn't make the film any better, on the contrary...
