A warrior's mission, a woman's desire... And the unnatural evil that could destroy them both. What could Christophe, a powerful Warrior of Poseidon, have in common with Fiona Campbell, prim and proper Scottish illustrator of fairy tales by day and notorious jewel thief known as the Scarlet Ninja by night? Answer: the Siren, a legendary Crown Jewel that Fiona has targeted for her next heist. It's said to be worth millions, but to Christophe it's invaluable. For the Siren also happens to be one of the missing jewels from Poseidon's trident. But breaking into the Tower of London is a two-person job, so Christophe and Fiona team up to commit the crime of the century. As newfound passions fire their motives-and cloud their judgment-they realize they aren't the only ones after the priceless gem. A dark force is shadowing their every move and threatening to shatter their trust with revenge, betrayal, and a haunting revelation about the past.