1815. Peter and Paul Skillen, identical twins and fearless thief-takers, stalk all who dare to walk in the shadow of the hangman. When they catch a notorious burglar, they claim a handsome reward and infuriate the Bow Street Runners who believe they have a monopoly on policing in the capital. The Home Secretary, Viscount Sidmouth, faces a crisis. During a massacre of American prisoners of war at Dartmoor, two escape and come to London in search of retribution. If their demands are not met, Sidmouth will be killed. The Skillen brothers are hired to catch the fugitives and must compete with the Runners to bring the villains to justice in a compelling tale of murder, kidnap, revenge, intrigue and political machination.