The Son of Neptune- Rick Riordan

I recentely finished the book The Son of Neptune, which is a continuation of the Heroes of Olympus series, which is a spin-off of the Percy Jackson and the Olympians series. In the novel, Percy arrives at the Roman camp with no memory of his life at Camp Half-Blood. He then meets Hazel and Frank and he goes on a mission to save the new camp. They have to travel to Alaska to attack the giant who made Alaska his home. All throughout the book, Percy has experiences that help recall his memory, like meeting Nico Di'Angelo, again. The group of three had to fight against gods, basilisks, and even Amazon warriors. Their quest to Alaska was to free the god of death, Thanatos, from the giants chains. Without him, any monsters that demigods killed just came right back to life because Gaea showed them escape routes from tartarus, which is the place in the underworld where monsters go once they've been killed. Percy learns more about his companions on his journey, like how Hazel has the gift of pulling precious gems from the ground, but it can be perceieved as a curse because they kill anyone that touches them. Frank's life depends on a stick, and when it burns, he dies. The trio complete their quest, saving Thanatos, and return to camp in time for the battle between the giant who was created to kill Neptune, and the camp. They win the battle just in time for the other heroes of the prophecy of seven to arrive from Camp Half-Blood.