Knight, pb, 1976
Life in a vicarage can be dull for Clarissa, the vicar’s daughter. Then she is invited on a riding and camping trip by the ghastly Cummings girls, who only want Clarissa because they can get no one else. The big obstacle to this plan, though, is that Clarissa has just sold her undistinguished pony, Trundle. Then Clarissa comes across the Darrells, who are much, much more unpleasant than the Cummings: murderously so.