Adam Winters is killed by a drunk driver. His devastated widow, Nicki, realises she is being stalked. Offered an escape to a cottage by the sea, she and her daughter Willow arrive on the Pembrokeshire coast. They settle into the community. But are drawn into troubles they have driven two hundred and fifty miles to avoid: family deceptions, jealousies, lies, a disappearance and a suspected killing. Struggling to find peace with the past and truth in the present, Nicki discovers there is more than one sort of fatal collision.