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 into his life - 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 theyre for him. Urged down a disconnected path, the closer he gets, the less Q sees of the girl he thought he knew. Printz medalist John Green returns with the brilliant wit and searing emotional honesty that have inspired a new generation of listeners.