Insidious Intent by Val McDermid

A quiet night on a country road. The stillness shattered by a car engulfed in flames, and a burned body discovered in the driver’s seat. As the investigation unfolds, DCI Carol Jordan and psychological profiler Tony Hill quickly realise that this is more than just a tragic accident. And so begins the hunt for a truly terrifying
killer, someone who believes he is invisible, untraceable and
untouchable.

As other victims are found to have met the same terrible fate, and with more women at risk, Tony and Carol are drawn into a dark and twisted web of
fear and revenge that will force them to question their own ideas of justice
. . .