Just when 12-year-old Jack Morrow’s life is falling apart he discovers his natural ability to travel through Sorrowlines: channels that connect every gravestone with the date of the person’s death. Confused and alone Jack finds himself in 1940. He embarks on an adventure through London during the Blitz with Davy, his teenage grandfather, to find a mystical Rose that might just save his mother’s life, a mother who he has already seen die. But the terrible power of the Rose of Annwn, is sought by many, and the forces of a secret world are determined to find it first. With a league of Undead Knights of his trail, commanded by the immortal Rouland, can Jack decipher the dark secret hidden at the heart of his family? Can he change his own destiny and save his mother?