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.

After a knee injury destroys sixteen-year-old Cody's college hopes, he drops out of high school and gets a job in his small Montana town; but when his ex-girlfriend disappears from her Vermont boarding school, Cody travels cross-country to join the search.

Sixteen-year-old Angie finds herself in her neighborhood with no recollection of her abduction or the three years that have passed since, until alternate personalities start telling her their stories through letters and recordings.

Darcy, who has a reputation and is used to rumors swirling around her, wrestles with what happened the same night her friend disappeared the previous summer and struggles with the weight of the dark secret she and her cousin share.

Hunter Braque, a New York City teenager who is paid by corporations to spot what is "cool," combines his analytical skills with girlfriend Jen's creative talents to find a missing person and thwart a conspiracy directed at the heart of consumer culture.

When her mother is abducted by aliens on Christmas Eve (or "Smekday" Eve since the Boov invasion), 11 year-old Tip hops in the family car and heads south to find her and meets an alien Boov mechanic who agrees to help her and save the planet from disaster.

Jay is forced to continually cover for his sister, Nicole, who hangs out with the wrong crowd; however, Jay can't deal with it any more. Soon after, Nic fails to return home. When she's deemed missing, the police barely bother to search for her; she's just another lost Black girl. Jay feels guilty and he thinks, "If I hadn't hung up on her that night, she would be home spending time with our grandma. If I was a better brother, she'd be finishing senior...

Two years after the disappearance of her older sister, sixteen-year-old Ellie goes on a quest, with help from her attractive and adventurous new friend, to find her.

A teenaged girl and her boyfriend must find her older brother after he wanders into their town's swamp and a mysterious girl appears in his place.

When his father disappears while experimenting with a black mirror that is a portal to both the past and the future, Jake encounters obstacles when he tries to use the mirror to find his father.