RSVP: No

A drunk promise. A surprise engagement. Seven days to stop the biggest mistake of her life.Oliver "e;Ollie"e; Banks has a spreadsheet for everything: his finances, his meals, and his five-year plan. But there is one variable he never accounted for: Daisy Thorne, his chaotic, effervescent best friend, actually following through on a drunken pact they made in college. If we're single by thirty, we marry each other.With their thirtieth birthdays just a week away, Ollie was quietly preparing to cash in on that promise. Instead, Daisy returns from a whirlwind vacation in Cabo with a ring on her finger and a fiancé named Chad—a man who is handsome, rich, and objectively terrible.Ollie has seven days to prove Chad is a fraud without looking like a jealous saboteur. But as he digs into Chad's shady past, Ollie's perfectly organized life begins to spiral. He's breaking laws, stalking social media, and worst of all, realizing that his motivation isn't just protecting Daisy—it's that he's been in love with her since the night of the pact ten years ago.When the smoking gun finally arrives hours before the ceremony, Ollie faces an impossible choice: hold his peace and watch the woman he loves marry a con artist, or speak up and risk losing his best friend forever.