Path of Night (The Chilling Adventures of Sabrina #3) by Sarah Rees Brennan

IT'S NOT EASY BEING THE DAUGHTER OF THE DEVIL.

Sabrina Spellman has just discovered the truth about her parentage - and that it's her destiny to rule hell.
   As usual, Sabrina has other plans for her future. She found a way to stop her father . . . but her plan didn't go quite as expected. Now Lucifer Morningstar is caged in the body of her boyfriend, Nick Scratch.
   Sabrina knows there's a way to get Nick back, she just has to figure out what it is. So when Aunt Zelda - now the Church of Night's high priestess - mentions an ancient quest that might open the gates of hell, Sabrina and her best friend finds Harvey, Roz and Theo are all in.
   But Zelda failed to mention that the quest has a few perils of its own. Can Sabrina's mortal friends survive the challenges they'll meet along the path of night?