An act of villainy
(Book)

Walking through London's West End after a night at the theater, Amory Ames and her husband Milo run into wealthy investor and former actor Gerard Holloway and his wife Georgina, old friends of theirs. When Holloway invites them to the dress rehearsal of a new play he is directing, Amory is shocked to learn that Holloway has cast his mistress, actress Flora Bell, in the lead role. The casual invitation is not what it seems-- Holloway has been receiving threatening letters, and he needs their help in finding the mysterious sender. It quickly becomes clear that each member of the cast has reason to resent Flora, and soon the scene is set for murder. -- adapted from jacket