Let the Devil Sleep by John Verdon

Layers Upon Layers
Objectivity and Self-Belief
Dvae Gurney, the most decorated homicide detective in NYPD history, re-examies a notorious serial murder case. He challenges the consensus opinion. Difficulty is a magnet for Guerney.
John Verdon is a new author and this is his third novel.
A definite read !!! Fantastic !!!