At twenty-one, I'd mastered two things: sarcasm and casual hookups. Commitment wasn't on the list. So when my lifelong best friend Leo announced he was marrying Clara—the girl he'd loved since middle school—and I was the best man, I should've been honored. Instead, they dropped the real bomb: I'd have to plan everything with Clara's best friend, the maid of honor, a girl I'd never met.

Great. Me, the guy everyone wants but no one actually knows, stuck coordinating flowers, schedules, and emotions with a stranger. I didn't do feelings. I barely did people. But Leo had always been my person, the only one who liked me for me, so I said yes. Even if it meant spending way too much time with a mystery girl who might change everything.