No Trace Remains (DS Pete Gayle thriller series, Book 18)

A car is left abandoned on a quiet country lane outside of Exeter. The engine is running, the headlights on, the driver's door open. And the young female owner is nowhere to be found.
To all outward appearances, she was happily and successfully engaged in her college studies, friendly and well-liked by all who knew her. So, what happened on her early-morning commute and where has she gone? Did she leave of her own volition? Was she snatched by a random attacker? Did someone from her past re...