Red Demon — Deidre Knight

Deidre Knight continues her "unique world building"* in the new Gods of Midnight novel, in which immortal Spartan warriors fight for humankind while battling their own desires...

Having recently assumed the power over life and death for the immortal Spartan brotherhood, Aristos Petrakos still hasn't mastered his unpredictable abilities. Now a medium brings him a message from the other side -- a romantic message Ari doesn't want to hear.

More than a century ago, the love of Ari's immortal life, Juliana Tiades, drowned in the Savannah River after she learned about Ari's shape-shifting abilities. Desperate to reveal the truth about her death, Juliana makes a bargain with a Djinn demon who offers to give her physical form. But as Juliana and Ari are reunited in passion, the debt must be paid -- in souls and spirits.