It's fall in North Harbor, Maine, where Sarah owns a charming secondhand shop. A cold case heats up when Mallory Pearson appears at Sarah's doorstep. Mallory's father is in prison for negligence after her stepmother's mysterious death in a house fire, but Mallory believes he's innocent and asks the quirky team of senior citizen detectives who work out of Sarah's shop to take on the case. With Sarah and Elvis lending a paw, they decide to try to give Mallory's father a second chance of his own...