"Harry Palmer" (Michael Caine) has a reputation with his boss "Ross" (Guy Doleman) of being a bit of a pain in the neck. It comes as as source of great delight, then, when he gets to redeploy him into the department of "Dalby" (Nigel Green). His task? Well it seems that there's quite a sophisticated operation going on to kidnap and brainwash some of the top scientists of the day. "Palmer" is a bit sceptical about the whole thing - not least because he thinks he's been chosen in the hope that he won't come out alive... Anyway, as his investigation progresses he starts to smell quite a large rat in his organisation and realises that neither his old nor his new boss entirely trust one another! Can he stay alive long enough to solve the puzzle? This is quite a compelling adaptation of Len Deighton's novel with Caine on top form as the almost recalcitrant man determined to discover who's the cat and who's the mouse. Nigel Green also delivers well here and once the template has been set out, this proves to be an engaging political thriller offering more than a decent indication at just how human torture can work - overtly and subliminally. It's maybe just a little too slow out of the blocks, but once it's going it's a good watch and no matter how many times I watch it - I never quite remember what happens at the end!