Heart of Tartarus: A Hades and Persephone Retelling (Faeries of the Underworld Duology) by Katherine Macdonald

A friendship rekindled. A love lost. A world doomed. Confronted by an impossible decision, Hades made the ultimate sacrifice and cast himself into the deepest pit of Tartarus to save the world and the woman he loved. Now lost to her forever, he roams the Underworld, wounded, hopeless, and alone. But he will find allies in strange places, and while he drifts further into despair… all is not lost. Yet. For the Titans’ are stirring, and they will have their revenge. Relive the final part of Hades and Persephone's journey through Hades' eyes. Contains the bonus epilogue from the special edition!