When osamond looks into her crystal ball to read Nate the Great's future, she sees a new case for him to solve--her money box is missing and she wants him to find it.

When Annie tells him about her missing painting, Nate the Great and his trusted companion, Sam Spade, set out to investigate, gather clues, and solve the mystery.

When the Aldens spend the summer riding on a train, they get to live in a train car once again - this time, they're staying in Caboose No. 777. The number is hard to forget, and indeed, the children meet people at each stop who seem to know it well. It turns out Caboose No. 777 has an unusual past - one that comes with its very own mystery!

When fifth-grader Cam notices that the prizes for the most difficult game at the school carnival are rapidly disappearing, she uses her amazing photographic memory to investigate.

Using her photographic memory Cam Jansen joins Eric in solving the mystery of how some of the school computers were stolen.