A woman is sent anonymous emails from someone claiming to know what happened to her husband Phillip Mackenna, a prominent scientist working on cold fusion who disappeared while on a train to Paris. As the team investigate, DAC Strickland receives a warning from Whitehall.
| Creator | Nigel McCrery |
|---|---|
| Actor | Dennis Waterman, Tamzin Outhwaite, Denis Lawson |
| Country | United Kingdom |
| Production | Wall to Wall |