A frozen body. A forged signature. A town built on a paper trail of lies.
In the frost-bitten village of Oakhaven, Vermont, Ivy Mayfield runs the local post office with the precision of a Swiss watch. She knows the town's secrets by the weight of their envelopes and the quality of their ink. But when the estate of the town's wealthiest recluse, Arthur Penhaligon, submits a "Change of Address" card for a trekking trip to Nepal, Ivy's sharp eyes spot a fatal flaw: the signature is a perfect forgery.
While the rest of Oakhaven believes Arthur is halfway across the world, Ivy's investigation leads her to a chilling discovery in a locked walk-in freezer. Beneath the Egyptian cotton shrouds lies a man who shouldn't be dead-and a paper trail that suggests the entire town is complicit.
Aided by her best friend, the blackberry-muffin-making Martha, Ivy must navigate a labyrinth of ancient ledgers, botanical poisons, and the dark secrets of the local Sheriff. But in a town where every letter is a weapon, Ivy soon realizes that the person she's hunting isn't just a killer-they're an expert in the art of the "Return to Sender."