Beloved lunch lady Diana Dumpling has suddenly vanished. Can Mariella and the Mystery Girls solve this kitchen nightmare?

When the goddess Artemis goes missing, she is believed to have been kidnapped. And now it's up to Percy and his friends to find out what happened. Who is powerful enough to kidnap a goddess?

"Eleven-year-old Riley's mom has disappeared and Riley knows that if he leaves tributes for the whispers, magical fairies that grant wishes, his mom will come back to him"--

After Mickey witnesses his father's death and his mother's admission into rehab, he is sent to live with his estranged uncle and change high schools, but when Mickey's new girlfriend, Ashley, suddenly disappears Mickey refuses to let another person walk out of his life and follows clues that reveal truths about both Ashley and Mickey's father.

When her friend Monday Charles goes missing and Monday's mother refuses to give her a straight answer, Claudia digs into her disappearance. Monday Charles is missing, and Claudia seems to be the one person who notices. They've always been inseparable, and when Monday doesn't show up for school for two weeks, Claudia knows that something is wrong. Monday's mother refuses to give Claudia a straight answer, and her sister April is even less help. How...

On the eve of the first manned space mission to Mars, Secret Agent Jack Stalwart learns that chief rocket engineer has disappeared, then finds out the engineer is his father. He then vows to do what it takes to make the alleged kidnapper sorry for his act.

Sixteen-year-old Malencia (Cia) Vale is chosen to participate in The Testing to attend the University; however, Cia is fearful when she figures out that her friends who do not pass The Testing are disappearing.

"Forty years after a devastating flood changed the face of the earth, new consequences and challenges are still surfacing. Twins Will and Annalie thought the hardest part about this year was going to be their separation when bookish Annalie began life at a prestigious Admiralty-run boarding school and avid sailor Will stayed behind in the flood-damaged slums. But that was before ... their father disappeared, leaving a single coded clue to his destination....

One month before graduating from his Central Florida high school, Quentin "Q" Jacobsen basks in the predictable boringness of his life until the beautiful and exciting Margo Roth Spiegelman, Q's neighbor and classmate, takes him on a midnight adventure and then mysteriously disappears.

A young girl relates the facts that are known about the unexplained disappearance of the crew on the ship Mary Celeste in 1872, and challenges the reader to solve the mystery.