Sorrowline

Twelve-year-old Jack Morrow is used to life being complicated. His mother died five years ago, and his father is now headed for prison. But then Jack discovers he's a Yard Boy - someone with the ability to travel through Sorrowlines, the channels that connect every gravestone with the date of the person's death - and he is quickly pulled into an adventure beyond anything he could have possibly imagined.
Finding himself in 1940s war-torn London, with his then-teenage grandfather, Davey, Jack soon realises that his arrival in the past has not gone unnoticed. The evil forces of a secret world are determined to find him - and to find out all he knows. As Jack struggles to survive, he comes ever closer to unlocking the dark secret at the heart of his family, and to - just maybe - changing his own destiny .