Enid Blyton 
Secret Seven Fireworks 
Secret Seven #11

The Seven are all looking forward to Bonfire Night, and made a super guy. But an awful thing happens when Colin’s grandmother’s house is robbed whilst she is away and her maid, Greta, was locked in the larder whilst the thieves ransacked the house. Two of the thieves were caught by the police, but the third one got away, and the Seven spot him on the field by the bonfire, before he goes off to hide again. Will the Seven manage to find him before the police do?