Tenacity has been recently republished in ebook as The Dark Beneath.The debut novel from J.S. Law, featuring new series lead Lieutenant Danielle Lewis, has been heralded as 'addictively readable' by Patricia Cornwell, 'pacey, claustrophobic and utterly thrilling' by Eva Dolan and 'breathlessly plotted' by Emlyn Rees. Two hundred metres below the surface, she will have nowhere to run and nowhere to hide.A sailor hangs himself on board a naval submarine. Although ruled a suicide Lieutenant Danielle Lewis, the Navy's finest Special Branch investigator, knows the sailor's wife was found brutally murdered only days before. Now Dan must enter the cramped confines of HMS Tenacity to interrogate the tight-knit, male crew and determine if there's a link.Standing alone in the face of extreme hostility and with a possible killer on board, Dan soon realises that she may have to choose between the truth and her own survival. The pressure is rising and Dan's time is running out...