Books in Apple Signature series

In their new home in the country, Graham and his small sister, Matty, sense terrifying secrets are hidden there. Graham's father works on a state-of-the-art computer-guided weapons system for the future - shortly to be shown to the big players in the international weapons market. Troubled by the shifting presences and his small sister's conversations with an unseen young man she calls Paul, Graham looks for the key to the past. What he uncovers shakes the foundations of his existence: a secret First World War research establishment using British military prisoners as guinea-pigs, and a young man executed for speaking out. Past and future come together when his father is arrested for treason: the codes for the new weapons' operating system have been published on the Internet. By his father? Or, as Graham believes, the final act of the ghost of 'a young man who felt he'd failed in his own life and has seen the demons driven away in ours .

Cora lives with her mother and grandmother in a hamlet in the Yorkshire dales. The three are close, but Cora longs to meet her father, whom she has never seen. She likens him to an unknown man who is reported to have disappeared - 'vanished in a puff of smoke'. Chance events lead Cora to build a fantasy that, in the past, her father has come back to the neighbourhood in order to contact her. A burnt-out car on the moor; burglaries; stolen food - all convince her that her father is nearby and wants to meet her. But the moor is prohibited, and to search for him she has to ignore her loyalty to her mother and grandmother, the warnings given by her mother about her father, and the sensible caution of her friend, Emma...