When her best toy mysteriously disappears, Olivia the feisty pig is determined to find out who is responsible.

Biscuit is going to play in the big park. Wait, Biscuit! Where are you going? When Biscuit goes chasing a ball and at first doesn't come back, where could that little yellow puppy be? Young readers will love reading about all the fun things Biscuit gets up to at the bustling park.

A little boy offers advice to his cat, which is lost in the city, from taking shortcuts through safe alleys to finding a friend in the park.

It is library day and helper Yasmin is busy shelving books, but suddenly she discovers that her own special book is missing prompting her to calmly retrace her steps.

On a class trip to the birdhouse, Pinkalicious discovers that the parakeet's escaped and tries to bring the bird back home.

When her doll Marabelle goes missing, Nancy and her friend Bree become sleuths to crack the case.

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

Mr. Fish feels nervous venturing deep in the sea to look for Ms. Clam's lost pearl until Miss Shimmer helps him conquer his fear of the dark.

Pedro forms a new club with his friends dedicated to solving mysteries--and the first two assignments are finding his mother's locket, and his father's cell phone.

King's human, Kayla, has baked some treats for a friend's new puppy, Thor, but some go missing and it is up to King to find the culprit.