You were a recruit, asked to join a rebellion you didn't believe in- to fight against people you didn't know- all the while carrying around the knowledge and the secret that... You couldn't die. Not without extra steps. . . . . . .

Piper, Hazel, Nico and Leo run into trouble and then quite literally the Avengers. After being set a long quest, join the demigods as they join the mortal world and hopefully somewhere down the line, save it.