The Hardy boys track down the saboteurs who kidnapped their father.

When KC and Marshall see lights flickering at night in the Washington Monument, their investigation turns up a monkey, a hole in one of the monument stones, and a hundred-year-old mystery.

An archaeological expedition in the West turns into a desperate attempt to capture robbers and an escaped convict.

Miri is eager to return to her beloved Mount Eskel after a year at the capital, but the king and queen ask her to first journey to a distant swamp and start her own miniature princess academy for three royal cousins, but once there she must solve a mystery before she can return home.

"The InvestiGators are the best crime-fighting duo in the world. But not even their hi-tech training programs can prepare them for the return of their greatest nemesis, Crackerdile, in a shocking new form! Even worse, he's creating a team of super villains! Faced with the choice between saving themselves or catching the crooks, can Mango and Brash make sure the gator good prevails?"--

Six children help solve the mystery of a missing spyglass that has kept two brothers feuding for years.

Fourteen-year-old Bobby Pendragon, having learned he is a Traveler--someone who can ride "flumes" through time and space--is soon off to the alternative dimension of Denduron where he teams up with Loor, a girl his age from the warrior-territory of Zadaa, in an attempt to save the gentle Milago people from slavery.

When Katharine Tulman foils an attempt to kidnap her Uncle Tully, she finds herself caught up in international intrigue. Aware that there are people who want to turn her uncle's mechanical fish into an explosive device, and unsure of who to trust, she decides to fake her uncle's death and flee to Paris in search of Lane Moreau, her uncle's assistant.

When hackers target locations all over London, Kat leads the City Spies in testing security for the British Museum where a secret message leads them to Egypt and the ancient City of the Dead.

Every seven years, an important thing, like scent, disappears from the town of Sterling and Aila, sixteen, is determined to find the cause and how her recently-deceased mother was involved.