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 they’re for him. Urged down a disconnected path, the closer he gets, the less Q sees of the girl he thought he knew.
 
#1 bestselling author of The Fault in Our Stars John Green crafts a brillantly funny and moving coming-of-age journey about true friendship and true love.