Ezekiel's Shadow by David Ryan Long

The bestselling author Ian Merchant is "recently rocked by a powerful spiritual encounter. ... As Ian struggles with his faith and his craft, frightening events begin to occur. Someone is shadowing his daily life--an ominous figure who seems to have emerged from the pages of one of Ian's own novels. As the danger mounts, Ian must stand for what he knows in his heart is true and confront the haunting remnant of a life he thought he'd buried."