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 When Margo Roth Spiegelman beckons Quentin Jacobsen in the middle of the night—dressed like a ninja and plotting an ingenious campaign of revenge—he follows her. Margo’s always planned extravagantly, and, until now, she’s always planned solo. After a lifetime of loving Margo from afar, things are finally looking up for Q . . . until day breaks and she has vanished. Always an enigma, Margo has now become a mystery. But there are clues. And they’re for Q. Printz Medalist John Green returns with the trademark brilliant wit and heart-stopping emotional honesty that have inspired a new generation of readers.