Sheila St. John-Bennett never expected mastering her witch powers to be easy. Now, she's been swept aboard the Argo II along with her friend, Ethan, and told by a goddess that she must master being able to control the Mist, a magic so powerful that it makes being a witch seems tame. Along with her best friend, Eliza, and vampires Josh and Zach, they must race to save their friends who fell into Tartarus, defeat a fire giant, and a witch who may be even more powerful that Sheila.
Trapped in hell, Marcella and Branson must use every ounce of their powers in order to survive and reach the Doors of Death along with their friends, Percy and Annabeth. But it turns out that monsters aren't the only ones trapped in Tartarus- old friends and foes have come back to haunt them, bent on exacting revenge on Marcella and Branson's parents- by killing them. With only enemies to turn to and no one to trust, will they make it out alive?
Percy is a Shadowhunter. One of the best, here at the New York Institute. He has friends, but no one too close, not after everything. He focuses on training and killing Demons. What he was born for.
Annabeth is a Shadowhunter. One of the best, formally from California. Something changes and she has to move to New York.
(Has the Shadowhunter characters, but only briefly. This story isn't about them. It's about how our favorite demigods would have faired in a world so different, but so similar, to their own. This takes place before the Shadowhunter's series starts. Just because I don't want to get messy with plot lines and things.)