The Chestnut King(book)

 This is the third book in the trilogy of the 100 cupboards.
It is amazingly written, and has a great ending.
The book goes like this:


In The Chestnut King, Henry's Aunt Dotty, Uncle Frank and cousins from Kansas now live in Badon Hill, as well. Nimiane continues to stalk Henry. She wants his blood, as it will increase her power. The scar she previously inflicted on his face continues to grow and rot. Henry's father, Mordecai, fears the wound will kill Henry unless they can destroy the undying witch-queen soon.
Soldiers sent by the emperor of this world demand that Mordecai come with them across the sea. The emperor wants Mordecai to answer to charges that his family helped free Nimiane. Mordecai is more concerned about destroying the witch-queen and saving his son than his defense. He says he will respond to the emperor once he has completed his mission. He leaves for Endor, where Nimiane resides.
In response to Mordecai's disobedience to the emperor, the soldiers capture his family, including Uncle Frank, Henry's mom and his cousins. Then they set fire to the family's house, leaving Henry's cousin Henrietta and grandmother inside. Henry helps his grandmother and Henrietta escape through a cupboard portal that takes them back to Kansas. There, they enlist the help of Henry's baseball buddy, Zeke. Leaving Henry's grandmother with Zeke's mom, the three children travel through the cupboard leading to Endor.
The kids find themselves in a crypt with Nimiane's relative, a shape-shifting creature called Nimroth (or Blackstar). Nimiane has 10 henchmen, whom she controls with her mind. They're called fingerlings because they have fingers attached to the back of their heads. Coradin, the lead fingerling, follows Henry on his journeys through various worlds. Coradin and the fingerlings pursue the children through the underground tombs of Endor until Henry helps Zeke and Henrietta return to the attic in Kansas. Henry returns to Endor, finds his father and Uncle Caleb, gathers old manuscripts that may help them find the witch-queen's secrets and transports the papers back to Kansas.
Back in Badon Hill, Fat Frank — an incompetent fairy who has actually been stripped of his fairyhood — rescues three of the children in Henry's family. A group of fairies locates Frank and takes him and the children to the Chestnut King so Frank can answer for his un-fairylike conduct. Meanwhile, Uncle Frank and the other captured family members find themselves on a rough and unpleasant sea voyage.
Henry finds entry into the fairy world, where he seeks the help of the Chestnut King. The king makes a bargain with him: He will help Henry save his family and vanquish the witch-queen if Henry will take over as Chestnut King. Feeling cornered, Henry agrees. Henry is reunited with the family members that were with Fat Frank. Coradin and the witch-queen's other henchmen capture Uncle Frank's group, forcing Henry to confront Nimiane in her throne room. Henry disables the witch-queen just before she would have destroyed Henry and his loved ones. Instead of becoming the king himself, Henry makes Fat Frank the new Chestnut King.