The Second Death of Dr. Finck — Milly Reynolds

Two men are found in a beached boat, one dead, one seriously injured, stretching the resources of an already under-funded police force.
Suspended Detective Inspector Jack Sallt is reluctantly rushed back on duty to face his most perplexing and dangerous case yet, where old foes move in the shadows, threatening violence and controlling him with sensual taunts.
In the tense climax, Jack has to face his relentless enemies head on, risking not only his own life but also those of his colleagues and loved ones.