The Final Problem
| Episode Number | 3 |
|---|---|
| Season | 4 |
| Aired | 2017-01-15 |
| Overview | Someone has been playing a very long game indeed and, alone and defenceless, Sherlock and Dr Watson face their greatest ever challenge. |
| Runtime | 89 minutes |
| Absolute Number | 13 |
| Finale Type | series |