Dink and his friends investigate why pets, like Mrs. Davis's canary, Mozart, are mysteriously disappearing all over town.

Nate the Great and his dog Sludge look for Annie's housekey which has mysteriously disappeared.

Told from three viewpoints, teens Doris, Nell, and Grant find friendship and the possibility of love while working in Unclaimed Baggage, a store that sells items that went missing during airline travel.

When Biggie thinks DJ Suki has lost her beat, he and Mr. Dinkles decide to find it for her.

Nate and his dog Sludge are determined to find the recipe for his mother's monster cookies.

While traveling with her family to Holland to visit her grandparents, Trixie once again loses her beloved Knuffle Bunny.

When Adele walks her little brother Simon home from school he loses one more thing at every stop: his drawing of a cat at the grocer's shop, his books at the park, his crayons at the art museum, and more. When Simon's older sister, Adele, picks him up from school, he has his hat and gloves and scarf and sweater, his coat and knapsack and books and crayons, and a drawing of a cat he made that morning. Adele makes Simon promise to try not to lose anything....

When a wolf cub and little girl are lost in a snowstorm they must find their way home.

Nate the Great finds mystery at the beach when Oliver's beach bag vanishes.

When she goes to work with her mother on a Saturday, Adventure Girl uses her own special methods to help find a missing report.