Tilly is secretly in love with her best friend Tyler, but Tyler has announced that he's marrying Sarah, a girl he's only known for a few months, and someone who's completely wrong for Tyler. So Tilly decides to recruit Sarah's ex-boyfriend, Zach, to help her break up the happy couple. Oh Lord, what could go wrong? And what will happen when Tilly starts having feelings for *Zach*?

With a title like "How to Ruin a Wedding", you already know that this is going to be a big crash and burn. Author Sophie Andrews does a decent job, though, of bringing some nuance to the characters of Tilly and Zach (though not as much to the characters of Tyler and Sarah). I was concerned that this was going to move too far into formulaic tropes, but Andrews managed to keep it from going overboard.