The Midnight Kittens
"Pam and Tom are at home for the spring half-term holiday and are involved in some strange happenings. Enchanting wild kittens appear in the orchard, always on the stroke of midnight; a visit to a long-deserted house is followed by a meeting with a lady almost a hundred years old who lived there as a child. She knows of a secret room and a hidden painting"--Inside front dust jacket flap.