Featuring Tommy and Tuppence Beresford.

"Here is great news! A new story about that famous pair of sleuths, Tommy and Tuppence Beresford, who successfully solved the ticklish problems described by Mrs. Christie in 'Partners in Crime'. Tommy and Tuppence have a grown-up family now and are feeling a bit out of things until Tommy is given a special assignment to investigate fifth column activities. His whereabouts is supposed to be a secret, even from Tuppence, but it isn't so easy to keep Tuppence and danger apart, and so they embark together on a very difficult and exciting job. The action takes place in or near a seaside boarding house and Agatha Christie portrays in her own vivid style the inhabitants and their daily lives, and keeps us all on tenterhooks until the last thrilling episode is finished." -- Inside cover.