Dark deeds in the Lighthouse Library threaten to send Lucy Richardson's soon-to-be-wed cousin Josie to an early til-death-do-us-part. Winter falls on North Carolina's Outer Banks as Lucy Richardson and her friends joyfully help her favorite cousin, Josie O'Malley, plan her wedding. The owner and head baker of Josie's Cozy Bakery and her fiance, chef Jake Greenblatt, want a small, simple wedding. But to their horror, Josie's imperious grandmother, Gloria, descends with the "Louisiana Mafia," a gaggle of aunts, and cousins who intend to take control of the wedding plans. To smooth the waters, Lucy hosts a bridal shower at the Bodie Island Lighthouse Library. But it turns deadly when Mirabelle collapses soon after eating the gluten-free treats that Josie prepared specifically for her. Now, to save her favorite cousin from prison, Lucy will have to bring a crook to book.