Just in time for Christmas comes Parnell Hall's latest puzzle mystery, A Puzzle in a Pear Tree. In this round, series heroine Cora Felton and her indomitable niece, Sherry Carter, must track down a killer who's been planting clues in acrostics rather than crosswords. The fate of "The Twelve Days of Christmas" pageant in which the two ladies are performing hangs in the balance.