Ditched by the love of his life, Andrew, a US Navy lawyer, takes time off to spend with his sister, Nell. When he succumbs to temptation on the journey to Nell's home, the resulting one night stand with a grey-eyed woman leaves Andrew torn and confused. Andrew's holiday is soon disrupted when an officer on the submarine commanded by Nell's husband is caught with stolen plans. As a favour to his brother-in-law, Andrew agrees to act on behalf of the accused officer. A specialist team of NCIS agents is called in to lead the investigation-- the ex-love of Andrew's life among them. And the local NCIS agent assisting them? The grey-eyed mystery woman - Tait. As the investigation proceeds, what started out as a straightforward case becomes complicated, as long held secrets are revealed one by one. The key to solving the puzzle proves elusive, until one tiny piece of information exposes the biggest secret of them all.