Mandy, Celia, and Jonathan arrive in Holland wondering why Uncle Ned warned them that the tranquil land of windmills harbors a dangerous mystery.

Ring and Asia Wilde's wild life is anything but ordinary. Instead of attending school, they travel the world with their tutor and parents (scientists who work to protect endangered species). On their last adventure, they swung through the Amazon rainforest to save their mom from vile kidnappers--while defending the forest's population of golden lion tamarins. Now they're in Baja, Mexico--the Sea of Cortez to be exact--searching for the endangered...

Detective duo John Boarhog and Inspector Toadius McGee embark on a luxury airship to intercept an old adversary, but when the Society of Sleuths decides it is time for John's trial to gain full membership, there are no clear skies ahead.