Liverpool Sound and Vision Rating * * * *

Cast: Anthony Howell, Julian Wadham, Lucy Briggs-Owen, Phil Mulryne, Beth Chalmers, Tim Bentinck, Alan Cox, George Rainsford, Kieran Bew, Blake Ritson, Sophie Aldred, Colin Baker.

The murky world of forgery and counterfeit are the next in line to be investigated by John Steed and it gets all a little too close for comfort for him as the net closes in the third of the rejuvenated lost stories of The original Avengers scripts, the Square root of Evil.