Chief Harper comes to Cora Felton, asking her to solve a crossword puzzle found on the body of Old Man Overmeyer. Cora pokes into Overmeyer's death, hoping to prove he died of natural causes and soon learns the cranky hermit was the sole surviving member of a forty-year-old stock pooling agreement.

"When an elderly boarder at a Bakerhaven bed-and-breakfast drops dead during afternoon tea, there's nothing particularly suspicious about it--except for the Sudoku in his jacket pocket. But when a second body turns up in the window seat and an autopsy shows both men were poisoned with elderberry wine, the Puzzle Lady suspects she's dealing with a cold-blooded killer who for some reason is copying the Cary Grant movie Arsenic and Old Lace, in which...