One in six dogs go missing at some point in their lives, leaving bereft owners to search high and low, hang missing posters, check shelters, and hope for good news. But amid these grim statistics, countless happy endings are forged. Tails wag again. Best friends are reunited. Susannah Charleson, a trusted chronicler of the human/animal bond, dives headlong into the world of missing dogs. The mission to reunite lost pets with their families starts with Susannah’s own shelter rescue, Ace. While Susannah formally studies animal behavior, lost-pet search tactics, social media strategies, and the psychology of loss, Ace also steps up for training. Cheerful and resourceful, Ace has revealed a nose for the scent of lost pets, and together they help neighbors and strangers in their searching. When Susannah brings home a host of missing pets, she also finds a lost part of herself along the way. And when unexpected heartbreak shatters her own sense of direction, it is Ace—the shelter dog that started it all—who leads Susannah home. Inquisitive, instructive, heartrending, and hopeful, this is a tribute to the missing dogs—and to the found—and to the restless space in between.