Spider's Web by Agatha Christie

Clarissa, the second wife of Henry Hailsham Brown, is adept at spinning tales of adventure for their bored diplomatic circle. When a murder takes place in her drawing room she finds live drama much harder to cope with, especially as she suspects the murderer might be her young stepdaughter Pippa. Worse still, the victim is the man who broke up Henry's first marriage. Moreover Henry will be arriving shortly with a V.I.P. who might take a dim view of bodies in the drawing room. Clarissa's fast talking places her and Pippa in some hair raising experiences. By the time Henry arrives, the murderer has been unmasked and all is normal so normal that Henry is unable to believe Clarissa when she explains why there are no refreshments for their honored guest.