While solving the mystery of an old man's disappearing fortune, Nancy ends a family feud and reveals the identity of an orphan of unknown parentage.

"The fire wasn't Marlowe Wexler's fault. Dates should be hot, but not hot enough to warrant literal firefighters. Akilah, the girl Marlowe has been in love with for years, will never go out with her again. No one dates an accidental arsonist. With her house-sitting career up in flames, it seems the universe owes Marlowe a new summer job, and that's how she ends up at Morning House, a mansion built on an island in the 1920s and abandoned shortly thereafter....

"For over forty years, Ellen Raskin's Newbery Medal-winning The Westing Game has been an enduring favorite. This highly inventive mystery involves sixteen people (including a dressmaker, a secretary, an inventor, a doctor, a judge, a bookie, a burglar, and a bomber) who are invited to the reading of the very strange will of the very rich Samuel W. Westing. They could become millionaires, depending on how they play the game. All they have to do is...

Nate the Great investigates the disappearance of a homemade pillowcase belonging to Rosamond's cat Big Hex.

Nancy receives a letter meant for a British heiress who has the same name and, in her attempts to contact the other young woman, faces danger from a man who operates a Lonely Hearts Club mail fraud.

When Daisy's cat food keeps mysteriously disappearing, Kayla and the Pet Club set out to solve the mystery and decide to set out a squirrel trap to catch the thief.

In the late 1950s in the Midwest, a serial killer has been draining their victims of blood, leaving them otherwise undisturbed in their cars and homes. When a fifteen-year-old girl is found covered in blood amidst the latest corpses, she confides only in the sheriff's son but her story is unbelievable at best. August, 1958. A string of murders plagues the Midwest. The victims are found in their cars and in their homes, even in their beds: their bodies...

"When the creator of a high school gossip app mysteriously dies in front of four high-profile students all four become suspects. It's up to them to solve the case" -- Provided by publisher.

Four middle-school students, Gutters, Tad, Kayla, and May have formed a club known as the Braves and they take turns daring each other to do something mysterious. Kayla agrees to stay overnight in an Old Mansion but when the other three show up next morning, Kayla seems to be in a coma. A piece of paper nearby is marked with a huge letter K.

Seventeen-year-old Jared leads a group of younger boys to Eagle Point, but their planned fishing trip turns into an investigation of strange events surrounding the caretaker's cabin.