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While visiting their friend Wallis and her adopted daughter on Mount Desert Island, Maine, Josh, Dink, and Ruth Rose investigate why three white wolf cubs were stolen, and by whom.

The disappearance of a precious Vermeer painting, coupled with a series of seemingly unrelated and strange events, prompts eleven-year-olds Petra and Calder to combine their talents to solve an international art scandal.

In the midst of a series of unexplained accidents and mysterious coincidences, sixth-graders Calder, Petra, and Tommy lead their classmates in an attempt to keep Frank Lloyd Wright's famous Robie House from being demolished.

Guided by her rules, nine-year-old Allie works to get past being just the new girl at school, eagerly awaits the arrival of her kitten, and faces turmoil when her grandmother visits while the family is still settling into their new home.

Nate the Great searches for a missing weed after it disappears from a pot on Oliver's porch.

When Johnny Dixon takes a tiny skull from a haunted dollhouse, demonic forces are released, capturing Professor Childermass and leading Johnny on a harrowing chase to a deserted island off the coast of Maine.

When a diphtheria epidemic hits her 1840 village, thirteen-year-old Jessie discovers it is actually a 1995 tourist site under unseen observation by heartless scientists, and it's up to Jessie to escape the village and save the lives of the dying children.

Twelve-year-old Fletcher Moon, the youngest qualified private detective in the world, receives a diploma and gold-plated detective's shield after completing an Internet course, and sets out to solve petty crimes at school, but he forced to go on the run when, while investigating the town's biggest crime family, his badge is stolen and he is framed for several crimes he did not commit.

When Ted and Kat's cousin Salim disappears from the London Eye ferris wheel, the two siblings must work together--Ted with his brain that is "wired differently" and impatient Kat--to try to solve the mystery of what happened to Salim.

When seventh-grader Calder Pillay disappears from a remote English village--along with an Alexander Calder sculpture to which he has felt strangely drawn--his friends Petra and Tommy fly from Chicago to help his father find him.

During a dinner party, the lights go out and Mrs. Reynard's beautiful diamond necklace is stolen, but Piggins the butler quickly discovers the real thief.

A fifth-grader with a photographic memory and her friend Eric help solve the mystery of the stolen diamonds.

Dawn and her friend Lizzie are eager to get started on the camp treasure hunt.

Nancy Drew, the teen detective, and her friend, Ned Nickerson, find a pirate chest filled with gold coins in the hold of an old showboat.

The solutions to ten mysteries solved by Leroy "Encyclopedia" Brown are given in a separate section challenging the reader to match wits with the ten-year-old mastermind of Idaville's war on crime.