This is book number 3 in the Vicious Deep series.
Blood is in the Water...
Two days. That's all the time Tristan Hart has to prevent all-out war. Since discovering he was part merman and heir to the Sea Throne, Tristan has been fighting for his future, his friends--his life.
Now, to win the crown and save the girl he loves, Tristan will have to take the ultimate risk: unleash the ancient magic of Poseidon and release the kraken. Seriously. It's the only way to unite the three scattered pieces of the king's trident and stop the sea witch Nieve from taking the throne for herself.
Tristan's going to need all the help he can get. But the one person he could always depend on him has betrayed him--Kurt now wants the throne for himself. Brother against brother, it's a brutal race to the finish, and there can only be one winner.
The Vicious Deep Series:
The Vicious Deep (Book 1)
The Savage Blue (Book 2)
The Vast and Brutal Sea (Book 3)