The Mentor. The Detective Eric Shaw Trilogy, #1

What if someone you love is a serial killer? DCI Eric Shaw, leading a forensic team at Scotland Yard, together with DI Miriam Leroux from a Murder Investigation Team, is investigating the death of a known offender. Killed by two gunshots: one to his neck, execution style, but preceded by another to his groin, implying a more personal motive. Shaw's attention at work is often distracted by a young forensic investigator, Adele Pennington, who is a beautiful woman over two decades his junior.
However, his attraction to her is unreciprocated. Meanwhile, unbeknownst to the London police, an anonymous blog describes the details of a very similar crime. The author of the blog signs herself as Mina, like one of the victims in a case Shaw investigated many years ago. Twenty years ago Eric saved her. Who will save him now? Meet DCI Eric Shaw .