Fourteen-year-old Cici hopes for a romantic summer at the beach but instead finds herself trying to solve a murder which had occurred there the previous year.
A mysterious stranger visits the island where Simon and his sister Ellen live, bringing with him an unexpected storm and a riddle that may lead to treasure.
Lifeguard Clay Gibson tries to clear his friend's name when he is suspected of stealing forty thousand dollars from the water park for which they work.
Fourteen-year-olds Raphael and Gardo team up with a younger boy, Rat, to figure out the mysteries surrounding a bag Raphael finds during their daily life of sorting through trash in a third-world country's dump.
While learning to sail during a visit to his grandmother's at the Connecticut shore, eleven-year-old Tony becomes excited about the rumors of sunken treasure in the area and starts following a couple who seem to be making a mysterious search for something.
When a thief steals money from her mom's Garbage Busters project, Stephanie, a sixth grader, identifies herself as "Stevie Diamond, Detective" and sets off to find the culprit.
The Liberty Dog Show is being haunted by two monster mutts with glowing red eyes, and the Mystery Inc. gang are called in to investigate--but the gang suspects that these ghost dogs are too well trained to be real ghosts.
Fred's friend invites the Mystery Inc. gang on a "vacation" on the old pirate ship he just bought, but there seems to be another crew on board--a crew of skeleton pirates who intend to take their ship back.
Reports of zombies and grave-robbers alarm the people of a Louisiana swampland village, but Ruth Rose, Josh, and Dink begin to suspect that the supernatural may not be the cause of the eerie occurrences.
