April, 1933. To the costermongers of London, Eddie Pettit is simply a gentle soul with a near-magical gift for working with horses. When he is killed in a violent accident, the costers are sceptical about the cause of his death, and recruit Maisie Dobbs to investigate.

Maisie, who has known these men since childhood and remembers Eddie fondly, is eager to help. But it soon becomes clear that powerful political and financial forces are equally determined to prevent her from learning too much about Eddie's death. As Maisie uncovers lies and manipulation on a national scale, she must decide whether to risk all to see justice done.