Meredith Fox has been visiting Martha's Vineyard every summer for as long as her memory serves her. However, this particular summer marks her return following the passing of her sister. The upcoming season is bound to be emotionally intense, especially considering the entire extended family will convene for her cousin's grand wedding.
Regrettably, Meredith's longtime partner has abruptly ended their relationship a mere two weeks before the wedding, leaving her without a date. Fortunately, a welcome distraction awaits. The family upholds a tradition of engaging in an elaborate game of Assassin each summer, and this year's game coincides with the week of wedding festivities.
Curiously enough, the person she is tasked with "assassinating" turns out to be a charming groomsman. Meredith is resolute in avoiding any distractions that might lead to another ill-fated romance. However, as the week unfolds, her feelings for him become irresistible, jeopardizing not just her success in the game, but also her emotional well-being.
The annual assassin game, a cherished tradition within Meredith's family during the Martha's Vineyard summer weddings, presents a perfect opportunity to honor her sister's memory and reintegrate into the world. Yet, her alliance with the affable groomsman puts her at odds with winning the game and safeguarding her own heart.