Books in the The Earthbound Series, Volume 4 series

After ten years of separation, Tessa and Alec are called to the deathbed of Tessa's father and tasked with solving a mystery that points to WWII, the Nazi régime, and the shadowy world of the Djinn. Although their passion still burns, forgiveness requires more than desire. Alec, the Riddle King to the Defensori, is used to shutting out the world and working on his puzzles alone. But this time, he can't shut Tessa out. This time, he needs his estranged wife's help. Tessa and her gift hold the key, and failure could cost her sanity...or her life. Insecurity, immaturity, and misunderstanding drove them apart. Can they rebuild their shattered trust and work together to rescue a captive Djinni, stay one step ahead of the servants of the Fallen, and save their marriage along with Tessa's life?