The Book of Hours.
(Book)

Set in contemporary England, a grief-stricken widower determines to honor his wife's dying wish and unravel the secrets of a rundown mansion. After his wife's death, Brian Blackstone traveled aimlessly for two years. But he finally returns to confront the inheritance he doesn't want. His wife said that Castle Keep would bring him great joy; that it yields mysteries which would unlock the secrets within him. She has set up a series of riddles about the old estate that he must solve and that will lead him to spiritual peace. But for Brian, there is only the burden of trying to honor his dying wife's wish.