Principal Wagner confidently deals with a faculty washroom crisis, a psychic parrot, and a terrorizing gerbil, but when sixty-five erasers go missing, he enlists the help of the school's best problem solver and locator of lost items, twelve-year-old Lyle Williams, aka Mudshark.

When Max discovers that the lunch he's been looking forward to is missing, he and Ruby embark on a search for it.

Delighted when her parents allow her to adopt a goldfish, young Lainey wonders if she has made a mistake when she attempts to bring her new pet to Never Land.

When Emma's little brother Jake looks after the neighbor's dog in preparation for getting his own puppy, the pet goes missing and Emma and the rest of the girls have to find it before the owner comes home.

When she cannot find her favorite stuffed toy, a young girl asks her mother, father, and older sister for help.

The reader is invited to help Duck and his animal friends find a missing item.

The reader is asked to help Nate the Great solve the mystery of his friend Annie's missing dog Fang.

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

When one of Kayla's library books goes missing, King and Kayla's friend Jillian must help her solve the crime.

Sloane and Amelia clash with rival detectives when they travel to Tangle Glen mansion with the goal to find the two million dollars that went missing on the premises decades ago.