James Qwilleran and his talented team of feline sleuths, Koko and Yum Yum, investigate the supposedly accidental death of a cast member in a car crash on the eve of the Theatre Club's performance of Oscar Wilde's "The Importance of Being Earnest."

Philanthropist James Qwilleran and his crime-solving cats investigate the murders of a volunteer fire-watcher and a local curling champ as a mysterious crime wave engulfs the town of Pickax.

When Kristy, Claudia, Mary Anne, and Stacey, the members of the Baby-sitters Club, each receive mysterious calls while they are working, they decide to find out who is responsible.

While visiting the art museum with their teacher, Edward "Egg" Garrison and his friends realize that one of the paintings is a copy and try to investigate what happened to the original.

While searching for the guard end of a broken saber that will solve one mystery, the Hardy brothers become involved with a gang of bank robbers.

Thea Stilton returns to her old school, Mouseford Academy, to teach a course in adventure journalism, and investigates a mystery involving a strange inscription and a missing person along with five female students.

Jim Qwilleran and his feline sleuths, Koko and Yum Yum, investigate the disappearance of a wealthy railroad buff--and alleged multimillion-dollar embezzler--a case that becomes complicated by red herrings, a tragic train wreck, and a murder in a railroad tavern