As the class prepares for the holidays, Jigsaw takes the case of Lucy, who has lost her father's rare coin, and the mystery means having to interview a big, tough second grader named Bigs Malone.

Jigsaw Jones finds himself in competition with Reggie for the title of the best detective in town. Reggie relies on technology and charm to solve mysteries. Can Jigsaw prove that he is better?

Jigsaw Jones tries to find a missing good luck charm while on a winter vacation.

Adrian Lazarus, who became a zombie just before starting middle school, and new friends Gia, Zander, and Talal, navigate a mystery involving global warming, disappearing bees, and billionaire developers.

Something has been going on ever since eleven-year-old Ash McGinn and his older sister, Willow, checked in to the Exit 13 Motel. Their parents don't seem to notice anything strange, but the rooms and the hallways don't go where they're supposed to, the receptionist looks like he comes straight out of a horror movie, and there are creepy woods out back where Ash is sure some kind of monster is lurking. Ash knows it is up to him and Willow to get to...

When the class's Valentine candy disappears, Jigsaw and Mila try to figure out who stole it.