Olly and Elly are horrified when they discover their faourite shop is being robbed. Losses are great and the owner thinks he will have to close. But Olly and Elly turn detective and set a trap for the thief. With the help of their pet dinosaur Littlest, they manage to catch the culprit.
Used availability for Terrance Dicks's Littlest on Guard
May 1994 : UK Hardback