must read this book it is like percy and annabeth get stuck in tartarus and they get out with the help of Bob the titan.the doors of death needs to be closed .nico hazel frank leo jason piper and coach hedge close the doors in epirus and annabeth and percy close them in tartarus.they defeat clytius and phasiphae.hecate teaches hazel on how to control the mist.after that they go to athens to defeat the giants.
This is a very good book for teens . It is based upon teen fantasy fiction . I brought this to my children and they loved . I really recommend you my friends to buy this book and start reading from the first serious. Its a heart throb ;)