Before the chicken family can inherit Uncle Ebeneezer's mansion they must find six keys that have been hidden on the premises. Deciphering the clues--""knock on wood"" leads to a key left inside a book on superstitions, for example--keeps Holmesian Detective Mole busier than he was on his first case (1976). But meanwhile cluckish Mrs. Hen and Mr. Rooster decide that their brood would be happier back in the coop, and Uncle Ebeneezer's secretary, Agnes Stork, is deputized to turn the place into a home for sick birds (""How generous of you. . . I'm sure Ebeneezer would be pleased."") A small step up for Mole who's still underemployed by these featherweight clients.