Winter in South Dakota. A bus crashes & is stranded in a storm. There's a town 20 miles away, where a vulnerable witness is guarded around the clock. There's a strange stone building five miles further on. There's an evil man who controls everything.

Addie and her sister are about to embark on an epic road trip to a friend's wedding in rural Scotland. The playlist is all planned and the snacks are packed. But, not long after setting off, a car slams into the back of theirs. The driver is none other than Addie's ex, Dylan, who she's avoided since their traumatic break-up two years earlier. Dylan and his best mate are heading to the wedding too and they've totalled their car so Addie has no choice...