The Knights of the Redeemed Darkness. The Eternal Court

Dave Radden's (Ireland) debut novel anticipated incredible success: it made it into the top ten best books in Ireland, the list of must-read summer books for teens (BuzzFeed, New York), became the winner of 2016 among books for older teenagers... (BGE Irish Book Awards), winner of the Most Read Award at the SLA Great Reads Awards (2017), was included in the list of best books for older teens and children by the Irish Times (2016), best new children's books of summer 2016 (Guardian), and 100 best new books for children and teenagers in 2018 (Russia).
The wall between our world and the world of darkness is open. A meeting is about to take place: the denizen is to be thanked for saving the daughter of the eternal king, Grace. This is, of course, a great honor, but could it be a trap?..
For fans of Rick Riordan, J.K. Rowling, Philip Pullman. Mysticism, fantasy, adventure, and incredible characters.