Meredith Fox is ready to rejoin the world after losing her sister Claire eighteen months prior. Her family's vacation to Martha's Vineyard for a grand summer wedding presents the perfect opportunity. While the family's tradition of an assassin game promises to be a distraction in honor of her sister's memory, Meredith's plan is sidetracked by an unexpected alliance with a charming groomsman. What starts as a strategic partnership for the win turns into a romantic entanglement, placing Meredith before a dilemma: she's at risk of not only losing the game but also surrendering her heart. Caught between honoring her sister's legacy and exploring new love, will the summer break Meredith's rules or mend her heart?