Daphna Whispers is insanely gifted.

At age two and a half, she composed her first sonata.

At age eight, she completed an opera.

And now, at eleven and three-quarters, she is orchestrating a piano rhapsody.

With a résumé like that, it's no wonder she is a student at the prestigious Blatt School for the Insanely Gifted. But as sixth grade draws to a close, Daphna's mind is far from the upcoming "Insanity Cup" competition. She's preoccupied by her mother's disappearance two months ago.

When a mysterious man breaks into Daphna's small New York apartment, Daphna discovers that her mother's disappearance wasn't a random accident. Her mother knew something—and now somebody is after Daphna. What starts out as a simple fact-finding trip to the basement with her friends spirals into an international expedition. And while Daphna hopes to uncover the secret of her mother's disappearance on her global trek, the last thing she expects to uncover is an outrageous secret about the Blatt School.

And one insanely shocking secret about herself.