When a sinkhole opens up and swallows one of Bayport?s historic statues, Frank and Joe suspect something?or someone?shady at play. They jump at the chance to investigate; Joe as a member of an urban exploration club, and Frank as photographer for the school paper. But in the thick of their search, the boys stumble upon an entire underground city that?s been abandoned for years. Now the city is home to a cultish band of criminals who plan to take over...

Lemony Snicket investigates his own possible murder after receiving a note under his door stating that his breakfast was poisoned.

The election celebrations of a new Kalamazoo City mayor are overshadowed by a crime spree and the activities of a mysterious hulking creature that are baffling detectives Zengo, O'Malley, and Cooper.

"Someone is trying to hunt FunJungle's Asian greater one-horned rhinoceros, and twelve-year-old Teddy Fitzroy is on the case"--

When therapy dog Buddy attends the fourth grade sleepover in the school's library, he solves the mystery of the school ghost.

When a troublesome ghost threatens to ruin a Halloween night at Cap'n Turbot's costume party, the PAW Patrol investigate the haunting.

Idaville's secret weapon against lawbreakers, ten-year-old Leroy "Encyclopedia" Brown, helps the police force solve ten new cases, the solutions to which are found in the back of the book.

"Detectives Rick Zengo and Corey O'Malley investigate foul play at the opening of the Kalamazoo City Dome, the world's largest indoor amusement complex"--

Twelve-year-old Steve is investigating a diamond heist but the case suddenly changes when the author of the Bailey Brothers detective novels writes him a letter to say that he fears for his life.

When the daughter of Bayport's amusement park owner goes missing, Joe and Frank follow clues to find the girl and determine if her disappearance is related to that of another missing person.