Cassie and Mitch are newly engaged, and it's time to meet the in-laws. When environmentalist Herb Flores turns up dead beneath a sand castle, though, they have to balance investigative work with family obligations. With suspects like a board president, a female bodybuilder, and the Chief of Police, identifying Herb's killer is a risky business. Throw in their families, a high-maintenance cat, and sand sculptures, and the town of Fatmire, Florida, just got more interesting.