Ropes, revolvers, daggers, arsenic . . . all classic murder weapons. But death by bookcase? True, a crafty killer can keep investigators guessing: did it fall or was it pushed? That's what Midwestern librarian Karen Nash must determine when an avalanche of books and wood fatally flattens Sally Burroughs. And Karen's squeeze, London B&B proprietor Caldwell Perkins, appears to be the most likely suspect. In the library. With the bookcase.