Author Sarah Alderson adapted her own novel, and the screenplay is made slick with clues, dead-ends and sinful temptations that don’t materialize to much.

A large glass of white wine on a Friday night.

Fast-moving enough to provide a decent night’s disposable home entertainment for viewers whose expectations aren’t geared any higher.

Not a bad little number, this, well-directed to the genre template by Kim Farrant and with an excellent supporting performance by Luke Norris as Beth's husband Rob. His scene on the phone is a mini-masterclass in emotionally authentic acting.