Eudora McVeigh, a rival mystery writer, arrives at Jessica's door with seemingly friendly intentions, but the discovery of a corpse and a web of deceit follows her to Cabot Cove leading Jessica to suspect the woman of ulterior and sinister motives.

After Seth is hospitalized and diagnosed as poisoned, with an apple Eudora gave Jessica, she still believes in her colleague's innocence. Sheriff Metzger discovers the murdered P.I. was following her husband, Hank Shipton, and found him adulterous with rich Victor Casper's wife, Lisa. Hank's son, Bobby, is beaten up by local Arnie on account of pool bet debts. Jessica ties up all the loose ends.