Brooklyn Wainwright has triple-checked her wedding to-do list, and everything is on track for the upcoming ceremony with the love of her life, security expert Derek Stone. Her feuding college roommates Heather and Sara—whom she hasn't seen in 12 years—show up at her surprise bridal shower, and Brooklyn is touched when the women sort out their differences, and gift her rare books. Brooklyn's tranquility is shattered when one of her friends is murdered and one of the books turns out to be a forgery. With a killer and con artist on the loose, Brooklyn and Derek—with the unsolicited help of their meddling mothers—must set out on their 12th investigation (after Once Upon a Spine) to catch the culprit before their big day turns into a big mess.