A personal advertisement written in code attracts the attention of Tuppence Beresford. When Tuppence suspects that the code involves the Three Arts Ball, she persuades Tommy to attend dressed in costume. Tuppence's suspicions prove to be correct when a murder takes place, but as all of the guests are dressed in masquerade, identifying the killer may be more difficult than first thought...
Agatha Christie is the most widely published author of all time, outsold only by the Bible and Shakespeare. Her books have sold more than a billion copies in English and another billion in a hundred foreign languages. She died in 1976, after a prolific career spanning six decades.