The Whistle Blower (1986)

Spy thriller. Michael Caine stars as a retired naval officer and Korean War veteran. Nigel Havers is his son, a linguist working for GCHQ who is compromised after finding out too much about the true workings of the British establishment. 

The plot can be complex and difficult to follow. Still not sure why the Russian spy was held in a fake hotel constructed in an aircraft hangar, but all of this probably makes more sense in the original novel by John Hale. 

Caine is absolutely excellent, showing more diversity and range in his acting than he’s often credited for. Havers is likeable, too, despite his years of TV overexposure. There are also parts for James Fox and John Gielgud. 

It’s a consistently engrossing low-budget English drama that’s worth seeing if only for the scene in which Michael Caine gets his friend (Barry Foster) drunk on vodka while concealing his own sobriety.