Look Out, Secret Seven (Knight Books)
By Enid Blyton.
Description
It was Scamper the spaniel who smelt out the intruder when a Secret Seven member was impersonated at one of their meetings, and later on he shared in the moonlit watch in Bramley Woods when a very nervous Secret Seven waited for -- what? (from back cover) - from Amzon
ISBN(s)
034056993X, 9780340569931