| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | The Six Thatchers |
January 1, 2017
BBC One
|
90 | |
| S04E02 | The Lying Detective |
January 8, 2017
BBC One
|
90 | |
| S04E03 | The Final Problem |
January 15, 2017
BBC One
|
90 |
