The only reason for watching this spectacularly undistinguished little clinker is the presence of Michael Caine thirteenth in the cast list. We see his framed photograph early on and he's talked about a lot before finally emerging smirking from the shadows like Harry Lime in 'The Third Man'.
The story starts like 'The Day of the Triffids' with the hero temporarily blinded following treatment to his eyes. A lot then happens before you reach the conclusion but you won't care; and Delphi Lawrence is completely wasted as the foreign-accented femme fatale who puts in an occasional appearance.
Every now the music on the soundtrack barges in to tell you something dramatic has just happened; which, annoying as it is, is probably just as well since that's the only way you'd know.
