It is the fourteenth book in the Five Find-Outers series featuring Fatty, Pip, Larry, Daisy, Bets and Buster the Scottie dog, as well as Mr Goon and his nephew Ern.

Upon investigating the messages Mr Goon finds that there is no such house as The Ivies and there are around 15 people with the surname Smith in Peterswood.

Upon investigation the Find-Outers find that two caretakers live in it named Mr and Mrs Smith and that the building was previously called The Ivies.

After more investigation Fatty finds where the diamonds are hidden, but just as he is about to call the police, the two men arrive and lock him in a cupboard.

A furious Mr Goon and Buster are rescued from the locked cupboard and the two robbers are taken from the coal hole and arrested.