With Penn and Lexi determined to kill Gemma and replace her with another siren, Gemma, aided by Harper and Daniel, must delve into her enemies' mythical past and darkest secrets in a last-ditch effort to protect all that she holds dear.

"Saoirse Sorkova survives on lies. As a soldier-in-training at the most prestigious barracks in the kingdom, she lies about being a siren to avoid execution. At night, working as an assassin for a dangerous group of mercenaries, Saoirse lies about her true identity. And to her family, Saoirse tells the biggest lie of all: that she can control her siren powers and doesn't struggle constantly against an impulse to kill. As the top trainee in her class,...

Vowing to get her sister Gemma back from the siren sisters no matter what the cost, Harper must face dangers unlike any she's ever experienced. Fortunately, she has Daniel by her side, a gorgeous guy who's devoted to helping her find her sister--and who's immune to the girls' dark powers.

"My father's ships will be at the sirens' mercy. We will be the ones to reach the island first and claim its treasure for ourselves. Alosa's mission is finally complete. Not only has she recovered all three pieces of the map to a legendary hidden treasure, but the pirates who originally took her captive are now prisoners on her ship. Riden, still unfairly attractive, is a constant distraction, but at least he's under her orders this time. But when...

"When her father, the ruthless pirate king, discovers that a legendary treasure map can be found on an enemy ship, his daughter Alosa knows that there's only one pirate for the job herself. Leaving behind her beloved ship and crew, Alosa deliberately facilitates her own kidnapping to ensure her welcome on the ship"--