Amulet: Book Five Prince of the Elves by Kazu Kibuishi
The Elf King launches a new attack on the rebellious Stonekeepers, with a new ally and an ancient monster leading his army. Meanwhile, exiled Elf Prince Trellis explores his past in hopes of changing it. Emily continues her training as a Stonekeeper, trying to sort out how much she can trust the voice of her stone (which certainly seems extremely malevolent). Her brother Navin hits the front lines, piloting new and fun technology in the war.
The bulk of the story is on Trellis (hence the title) and on the past of many of the characters. Emily's new mentor, Vigo, searches for what happened to the Council that was supposed to protect everyone. He finds hints that things are worse than they thought, which makes a nice build up for later conflict. Trellis discovers that his extended family is not so evil as his father, so maybe there is hope for him yet.
The art is still very imaginative and impressive, with the occasional splash page reveal of important points or cool locations.