Soon to be a major motion picture! From the #1 bestselling author of The Fault in Our Stars Winner of the Edgar Award for Best Young Adult Mystery New York Times bestseller USA Today bestseller Publishers Weekly bestseller Quentin Jacobsen has spent a lifetime loving the magnificently adventurous Margo Roth Spiegelman from afar. So when she cracks open a window and climbs back in the middle of the night--dressed like a ninja and summoning him for an ingenious campaign of revenge--he follows. After their all-nighter ends, and a new day breaks, Q arrives at school to discover that Margo, always an enigma, has now become a mystery. But Q soon learns that there are clues--and they're for him. Urged down a disconnected path, the closer he gets, the less Q sees the girl he thought he knew.