The colonel Daniel Blimp, of the secret British service, travels to Bangkok to investigate the murder of the Brittish Ambassador happened during a holiday in his residence. Blimp receives the help of Keats, agent of the secret service. Both men discover that the man who shot against the Ambassador is blind, and it takes the black skin as a result of a strange phenomenon of mutation.

A bank robbery goes wrong. The robbers, two of them unemployed family men, take two hostages, one of them needing heart medication, and leave them in an apartment, tied to a bomb. The police has to find the apartment before the bomb explodes. At the same time, in the same house, two old men are solving a jigsaw puzzle, and a female cellist practices the Bach cello suites.