Grimnire, Book Three of the Timesmith Chronicles.
“The Rose of Annwn must be returned to Otherworld, or all life is lost.”
14-year-old Jack Morrow is lost in time. Gifted with the ability to traverse Sorrowlines – the pathways that connect every gravestone to the date of a person’s death – Jack is desperate to return to his friends in 1940s London, but he’s hundreds of years adrift.
Deep within him rests a great power stolen from another realm which must be returned. But there are others who would take it from him, including the burned and disfigured Rouland.