Despite an apparently water-tight alibi, there is something about the twins' behaviour that makes Walker uneasy, particularly as the dominant Michael seems to be controlling his asthmatic brother, and the boys are arrested and sent for trial. Family secrets start to be revealed when Michael claims a history of abuse from his father and it also comes out that Commander Daly was being unfaithful to his wife with Janet, the house-keeper, thus widening the net again.