View our feature on Alyssa Day’s Atlantis Betrayed. Another Warriors of Poseidon novel for romance lovers to dive into... What could Christophe, powerful Warrior of Poseidon, have in common with Fiona Campbell, the notorious jewel thief known as the Scarlet Ninja? 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, and Christophe and Fiona must team up to commit the crime of the century. Watch a Video