Catherine Coulter - Grayson Sherbrooke's Otherworldly Adventures Collection: Books 1-3

In "The Strange Visitation at Wolffe Hall," set in 1841, popular gothic author Grayson Sherbrooke is drawn into a chilling mystery when a neighboring girl, P.C., mistakes him for his fictional hero. She seeks his help against a terrifying presence at Wolffe Hall, linked to her great grandfather's obsession with Waterloo medals and a menacing force known as the Abyss. The subsequent tales in the series follow Grayson as he navigates various supernatural threats, from a ghostly warning in Scotland to an ancient curse in an Egyptian sarcophagus, all while protecting his young son and a growing circle of companions.