The Five Find-Outers and the Raided Safe
Book 4 of 4 in this category 
Book Details...
First edition: 1986
Publisher: Dragon Grafton
Cover Art: John Gillatt
Illustrator: Cathy Wood
Category: Solve-it-yourself Mysteries (by Stephen Thraves)
Genre: Mystery/Adventure
Type: Continuation Books
Publisher: Dragon Grafton
Cover Art: John Gillatt
Illustrator: Cathy Wood
Category: Solve-it-yourself Mysteries (by Stephen Thraves)
Genre: Mystery/Adventure
Type: Continuation Books