In 1903, fishermen find a wrecked boat containing a woman, who has been badly beaten, and a young girl. In 1993, All Hallows is now a boarding school. Following his mother’s death and his father’s hasty remarriage, Lewis Tyler is banished to Dartmoor, stripped of his fashionable clothes, shorn of his long hair and left feeling more alone than ever. There he meets Isak, another lost soul, and whilst refurbishment of the dormitories is taking place, the boys are marooned up in the attic, in an old wing of the school.

It’s summer and holidaymakers are flocking to the idyllic Brittany coast. But when first an old traveller woman dies in suspicious circumstances, and then a campaign of hate seemingly drives another victim to take his own life, events take a very dark turn. Mila Shepherd has come to France to look after her niece, Ani, following the accident in which both Ani’s parents were lost at sea. Mila has moved into their family holiday home, as well as taken her sister Sophie’s place in an agency which specialises in tracking down missing people, until new recruit Carter Jackson starts.

When Edie’s mother-in-law, Anna DeLuca, dies, she is relieved. Edie blames Anna for the accident that destroyed her family. So, when her will lures Edie to Sicily and the long-abandoned Villa della Madonna del Mare, she sees through Anna’s games. Suspecting Anna is meddling from beyond the grave to try to reunite her and her ex-husband Joe, Edie is determined to leave Italy as soon as possible.

In the long, hot summer of 1995, 22-year-old Alice Lang rents a caravan on a holiday park on the outskirts of the lively holiday resort of Severn Sands. She befriends Marnie, a shy, damaged little girl whose father is the park's caretaker and whose mother died a few months earlier. Will, whose mother runs the bar, falls in love with Alice and is unbearably jealous of anyone else she sees. Tensions rise until one evening Alice disappears from her caravan. She's never seen again, and only her scarlet dress is found washed up on the shore.

It's a blindingly hot summer. International visitors surge into Sydney's Darling Harbour. Two-year-old Tommy is sailing his toy boat in the park there with his mother Phoebe. Tommy vanishes into thin air. The following winter, taunting notes written as nursery rhymes begin arriving at his parents' home. Little Boy Blue, where did you go? Who led you away? Only I know.