Throne of the Fallen by Kerri Maniscalco

Sinner. Villain. Wicked. These are names the Prince of Envy welcomes when he ventures beyond his demon kingdom in the Seven Circles. Each word reminds him what he isn’t: a saint. And when a cryptic note arrives, signalling the beginning of a deadly game, he knows he’ll be called much worse before it ends. Riddles, hexed objects, anonymous players, nothing will stand in his way. With a powerful artefact and his own future at stake, Envy is determined to win, though none of his meticulous plans prepare him for Waverly Green, or for her, the frustrating artist who ignites his sin – and passion – like no other.