Emma Propeller is trying to swerve the wreckage of her marriage.

When her husband returns from rehab with a new lover, Emma bolts with her baby on a midnight train to a castle in the Scottish Highlands. A job as a live-in driver for a glamorous marchioness promises safety and the chance to reinvent herself. Everything seems to have fallen into place.

But the castle is no sanctuary. Dark secrets stalk its halls, the marchioness’s behaviour spirals into the unhinged and someone, Emma suspects, is following her. She hasn’t steered herself out of danger – she’s driven straight into it.