Dragon, London, pb 1977
Severn House, London, hb 1979
Simon & Schuster, London, hb and pb 1992
A little girl is lost on the marshes, and the Pony Patrol, together with new member Alison, join the police search for Maggy.
Pony Patrol S.O.S.
Pony Patrol Fights Back
Pony Patrol And The Mystery Horse
There is a short story called Pony Patrol Ends a Racket, published in Pony Parade in pb, 1978