When the Hardy Boys set out to solve the mystery of their missing chums, they discover a gang hide-out in a cave on an island along the way.

A feisty eleven-year-old princess embarks on a dangerous mission to find her missing mother, uncovering dark secrets inside and outside the castle walls.

Enola Holmes, Sherlock Holmes's younger sister and self-declared finder of lost persons and things, is determined to find her friend, Lacy Cecily, a confused young Baronet's daughter on the run from her father's devious schemes.

"Jada Sly, artist and spy with a flair for all things French, is on a mission to find her missing mom, who she believes was also a spy"--

Born on Water Island in the Virgin Islands during a hurricane, which is considered bad luck, twelve-year-old Caroline falls in love with another girl--and together they set out in a hurricane to find Caroline's missing mother.

A series of letters reveals the selection of the famous fountain designer, Florence Waters, to design a new sink for the Geyser Creek Middle School cafeteria, her subsequent disappearance, and the efforts of a class of sixth-graders to find her.

When Autumn Casterly goes missing after a drug deal gone wrong, her estranged younger sister, Ivy, searches for her, uncovering dark secrets along the way.-- When band-geek Ivy and her friends get together, things start with a rousing board game and end with arguments about Star Wars. Her older sister Autumn, aloof and tough as nails, hasn't had real friends in years. After a drug deal gone wrong, Autumn is beaten, bound, and held hostage. Now, trapped...

"After finding a mysterious key, eleven-year-old Lin Rosenquist finds herself in the wintery world of Sylver where all the inhabitants were once either beloved pets or tamed wild animals, and must find the missing Winter Prince before she can return home"--

Eighteen-year-old Calli finds herself alone after the loss of her father--until a bruised and broken girl shows up on her property, forcing her to face the present, rethink her future, and unearth the skeletons of her own past.

Next-door neighbors, polar opposites, and best friends Micah and Janie hide their friendship from their classmates, but when Janie goes missing, everything Micah thought he knew about his best friend is colored with doubt.