This is book 4 in the series that began with The Iron Trial (review here). The series started off closely paralleling the Harry Potter series, but as it continues, it becomes something more and in its own way, better.
The series is full of magic, adventure, danger, heroes & villains, and even friendship & typical teen issues. The story begins with Call in magical prison because of who people think he is. He is rescued and then asked to do the one thing magic hasn't been able to do -- raise the dead.
I am still enjoying this fantastic series and I can't wait to see what comes next.