In 1860, Inspector Jack Whicher of Scotland Yard is sent to rural Wiltshire to investigate the murder of the three-year-old boy Saville Kent, who was snatched from his bed at night and murdered.
| Actor | Role |
|---|---|
 Paddy ConsidineInspector Whicher | Inspector Whicher |
 Peter CapaldiSamuel Kent | Samuel Kent |
 Tom GeorgesonSuperintendent Foley | Superintendent Foley |
 William BeckDolly Williamson | Dolly Williamson |
 Emma FieldingMary Kent | Mary Kent |
 Tim Pigott-SmithCommissioner Mayne | Commissioner Mayne |
 Kate O'FlynnElizabeth Gough | Elizabeth Gough |
 Donald SumpterPeter Edlin QC | Peter Edlin QC |
 Ben MilesDr. Stapleton | Dr. Stapleton |
 Alexandra RoachConstance Kent | Constance Kent |
 Jay SimpsonGeorge Redman | George Redman |
| PPeter GordonHolcombe | Holcombe |
 Charlie HiettWilliam Kent | William Kent |
 Sarah RidgewaySarah Cox | Sarah Cox |
 Ben CromptonWilliam Nutt | William Nutt |
 Ruairi ConaghanBenger | Benger |