Fountain A. Gidado

The unexpected arrival of Emily Clark's enormous fortune from a mysterious billionaire completely disrupts her life as a teacher in a small town. However, peril, secrecy, and a man hell-bent on destroying her accompany the riches. Ethan Monroe, the handsome but resentful son of the billionaire, thinks Emily is an imposter and will do anything to prove it.

Psychic investigator Sam Drewsbury has spent three years hunting the demon that murdered her twin brother, using her ability to see death echoes to track supernatural killers through Seattle's underground. But when she's hired by mysterious tech mogul to find his missing daughter, Sam discovers the girl wasn't kidnapped—she was sacrificed to open a portal between worlds.
Enter Kieran Braut, a centuries-old hunter bound by ancient magic to destroy demons before they can establish permanent footholds in the human realm. Cursed to feel every death he causes, Kieran has sworn off working with humans after his last partner's betrayal cost innocent lives.
But this isn't just another demon incursion. Someone is systematically weakening the barriers between dimensions, and Seattle is becoming a supernatural battleground. As Sam's visions grow stronger and more dangerous, she realizes her psychic gifts aren't natural—they're the result of demonic blood passed down through her family line.
Kieran needs Sam's unique abilities to track the portal locations, but her demonic heritage makes her both the key to stopping the invasion and the perfect vessel for the demon lord trying to cross over. With each use of her powers, Sam becomes more connected to the demon realm, slowly losing her humanity.