Persephone by Alessa Thorn

Life in Styx is finally stable for Persephone and Hades. The city is safe, and their re-established friendship with the Egyptian Gods brings a welcomed calm—until the meddling Fates disrupt their peace with an unexpected gift: a baby.
As if the idea of motherhood isn’t daunting enough, a mysterious voice beckons Persephone to an enigmatic island on the Nile. Ever drawn to adventure and somewhat avoiding a challenging conversation with Hades, Persephone embarks on a quest to find the source of the voice…and finds a whole lot more than she could ever dream of.