Kingdom of the Cursed - By Kerri Maniscalco

After selling her soul to become Queen of the Wicked, Emilia travels to the Seven Circles with the enigmatic Prince of Wrath, where she's introduced to a seductive world of vice.
She vows to do whatever it takes to avenge her beloved sister, Vittoria . . . even if that means accepting the hand of the Prince of Pride, the king of demons.
The first rule in the court of the Wicked? Trust no one. With back-stabbing princes, luxurious palaces, mysterious party invitations, and conflicting clues about who really killed her twin, Emilia finds herself more alone than ever before. Can she even trust Wrath, her one-time ally in the mortal world .  . or is he keeping dangerous secrets about his true nature? 
Emilia will be tested in every way as she seeks a series of magical objects that will unlock the clues of her past and the answers she craves