There's a clever pair of parallel 'suspicion' plots in this one - Tara is tasked with breaching the defences of the War Room as a test of security, and at the same time the elegant Dangerfield (Alan 'Temmosus' Wheatley) is setting up a web of circumstantial evidence to make her look like a traitor.
The second plot, however, requires 'Mother' and Steed to be uncharacteristically obtuse. Tara has to demonstrate the framing technique on Steed himself before he'll believe her.
Steed's exclamation of 'What a lovely suit!' before he starts beating up Dangerfield in the finale is predictable, but very enjoyable nonetheless.
Previously and also seen: Aimee 'Dona Arana' Delamain from November Five. Ralph 'Balaton in The Pirate Planet' Michael
Also seen: William 'Mailer' Marlowe.
Previously seen: Alan Browning returning from Intercrime, Alan Macnaught[ao]n from Town Of No Return, Richard Owens from The £50,000 Breakfast.