Agatha Christie's Partners in Crime: N or M?: Part 2

SINOPSIS

Part two of three. Tommy and Tuppence feel certain they have identified the spy staying at the Sans Souci - only for their suspect to turn up dead. They realise he was also looking for the secret agent, who may have resorted to murder to keep his identity secret. The couple each have very different ideas about who the killer is, with Tommy pursuing a shifty beatnik, while Tuppence goes after a mysterious woman travelling alone. Confused by the case, Tommy lets his guard down and unwittingly walks into a trap.