What the blurb says: “A brutal murder. A lone female investigator. Two hundred metres below the ocean’s surface, the pressure is rising … Suicide must be investigated, especially when a Royal Navy sailor kills himself on a nuclear submarine only days after his wife’s brutal murder.

Now Lieutenant Danielle “Dan” Lewis, the Navy’s finest Special Branch investigator, must interrogate the tight-knit, male crew of HMS Tenacity to determine if there’s a link. Isolated, and standing alone in the face of extreme hostility, Dan soon realises that she may have to choose between the truth and her own survival. Justice must be served, but with a possible killer on board the pressure is rising and her time is running out …”

This debut novel from J.S. Law is a tense read from start to finish. Danielle “Dan” Lewis – a top investigator with more than a fair share of secrets hidden in her past – is brought in to investigate the alleged suicide of a member of HMS Tenacity’s Ship’s Company. Right from the get-go it’s clear that the odds are stacked against her – Tenacity’s men are a close-knit team and they don’t want anyone – especially a woman – poking around in their business.

Despite the hostility towards her, Dan presses on with the investigation. Master-At-Arms John Granger lends his support (although there are unresolved tensions between the pair that make for a tricky working relationship) and it seems that the investigation will manage to move forward. Then Tenacity gets the order to dive, and Dan has to continue the investigation on-board beneath the ocean’s surface. As she studies the nuances of the case and interviews the men, Dan begins to uncover the lies and secrets hidden within Tenacity’s history, and the danger that might still lurk within.

Like the novel’s title suggests, Dan is a tenacious lead character and someone that, as a reader, I found it easy to root for. She’s a survivor of injustice, using her own experiences as fire to fuel her unrelenting determination to achieve her goal – utterly focused on searching out the truth, even when it puts her own life in danger.

As an ex-submariner, author J.S. Law’s detailed knowledge of the Navy and submarines shines through to make for a highly authentic and atmospheric setting. The uniqueness of the tightly sealed environment of HMS Tenacity is made increasingly claustrophobic through the ever-increasing build-up of jeopardy.

Gritty, super-charged with tension and claustrophobically atmospheric, TENACITY is a real page-turner of a read – perfect for fans of military thrillers and police procedurals.

Highly recommended.

[Many thanks to the lovely folks at Headline for my copy of TENACITY]