Marlott takes a terrified Pritty on their assignation to meet the men who kill for money – they find themselves in the tunnels under Smithfield market, which run from the Fortune of War pub to St Bart's Hospital.

Flora has returned to Marlott's lodgings, but now she is back Marlott intends to use her as bait for the murderous gang, much against Nightingale's wishes.

Marlott finally pieces together the movements at the hospital, but the number of suspects continue to plague his mind. Robert Peel meets with William Chester. Marlott gets authorisation to use a pistol.