The Liar`s Key by Mark Lawrence. The Red Queen`s War Book 2

Prince of Fools, The Red Queen's War: Book One had all "the hallmarks of [Mark Lawrence's] storytelling and writing style which made The Broken Empire trilogy such an incredibly addictive read" (Bibliosanctum.com). Now The Liar's Key continues the story of the unusual fellowship between a rogue prince and a weary warrior....

After harrowing adventure and near-death, Prince Jalan Kendeth and the Viking Snorri ver Snagason find themselves in possession of Loki's Key, an artefact capable of opening any door and sought by the most dangerous beings in the Broken Empire - including The Dead King. Jal wants only to return home to his wine, women, and song, but Snorri has his own purpose for the key: to find the very door into death, throw it wide, and bring his family back into the land of the living. And as Snorri prepares for his quest to find death's door, Jal's grandmother, the Red Queen, continues to manipulate kings and pawns toward an endgame of her own design....