Your college ex is bringing a woman you've never heard of to a wedding.

Normally, that wouldn't be your problem.

Except you and Philip have spent the past year blurring the lines between friendship and something neither of you wants to define.

You broke up years ago, stayed friends, and somehow found your way back into a familiar, comfortable arrangement. No labels, no expectations, no promises. You also never discussed what happens when one of you starts seeing someone else.

Apparently, you're about to find out.

Philip is bringing Claire.

And if he gets a plus-one, so do you.

Enter Simon: the ridiculously charming contractor you know from work, a man who likes a challenge and is unfortunately very easy to bait with the words "you're not game."

One wedding. One hotel. Your oldest friends. Philip's mysterious new date. Your unexpectedly intriguing plus-one.

What could possibly go wrong?