Suicide is always investigated. Especially when a Royal Navy submarine officer kills himself on board, only days after his wife's brutal murder. Now Lieutenant Danielle Lewis, the Navy's finest Special Branch investigator, is two hundred metres below the surface. Interrogating the tight-knit all-male crew of HMS Tenacity. Trying to determine if there's a link. In the face of extreme hostility, justice must be served and only the most tenacious will survive. For Dan pressure is inside. Outside. Everywhere... Tense, dramatic, claustrophobic and brilliant, this is Headline's crime launch for 2015.

A young Naval Wren disappears from the warship Defiancé. With no trace of the girl on board, Lieutenant Dani Lewis, star investigator in the Royal Navy's Kill Team, must work her way through a complex web of witness accounts to uncover why she might run, or what might motivate a predator to take her. But even as Dani hones in on the truth, threads begin to emerge which take her back to the recent conspiracy uncovered aboard the submarine Tenacity, and even further to the serial killer who continues to taunt her from prison. Is this a simple case of a missing girl or is the hunter about to become the prey?

A savage murderer taunts the police from his cell. Naval investigator Dani Lewis made her name by catching serial killer Christopher Hamilton, a master of manipulation who now lives to toy with the police. But when a stranger viciously attacks Dani, she fears Hamilton has one twisted game left to play.As the case spirals out of control, Dani realises Hamilton's deadly grip reaches deeper than she ever knew. With her sanity and family in peril, Dani has no choice but to confront pure evil - even if it drags up the darkest secrets of the past.