Princess Rosa's palace has been under a sleeping spell for one hundred years, and the spell will end at sunset; but Princess Rosa sleepwalks and when Kara and Zed enter the palace they find that she is missing--and the two fairies, Miranda and her son Leon, that have been caring for the sleepers do not seem particularly anxious to find her before the spell resets for another hundred years.

Frank and Joe's immersive murder mystery experience turns into a real missing person's case.

When the Hardy Boys set out to solve the mystery of their missing chums, they discover a gang hide-out in a cave on an island along the way.

"He Greystone kids thought they knew. Chess has always been the protector over his younger siblings, Emma loves math, and Finn does what Finn does best--acting silly and being adored. They've been a happy family, just the three of them and their mom. But everything changes when reports of three kidnapped children reach the Greystone kids, and they're shocked by the startling similarities between themselves and these complete strangers. The other kids...

"Dink, Josh, and Ruth Rose must solve a mystery when they go whale watching in Alaska"--

When their favorite author fails to arrive as scheduled to speak at the local library, the Alden children investigate how he could board a train and never be seen again.

Camp Nightmoon slowly changes from a fun place to one of terror.

When the evil Overtakers gain control of a computer server at the Magic Kingdom, allowing them to put the holographic hosts into permanent comas if they should fall asleep, Finn and the others race against time to find the missing Jez and foil the plan.

During an investigation of missing children in Misty Falls, Idaho, Frank Hardy has disappeared, just after the main suspect is found dead.

"Mister Max, Solutioneer, helps the mayor investigate a string of mysterious fires, while attempting to solve the mystery of his parents' disappearance on the side"--