They rarely speak to one another, but they do take notice―watching from the safety of the park's rented cabins, peering into the half-lit drizzle of a Scottish summer day, forming judgments based on what little they know of their temporary neighbors. It is the longest day of the year, and as the hours pass nearly imperceptibly, twelve people shift from being strangers, to bystanders, to allies―their idle curiosity sparked into action as tragedy sneaks into their lives.