At Cypher head quarters strange things are happening. Secrets will be stolen and nobody notices. The "cypher snatchers" are using a hypnotic gas so the complete crew sleeps and when they awakes no one can remember what has happened that day at head quarters. Tara who workstemporaly at Cyphers' will be a victim also. Her boss for the moment, is unsatisfied about the feats of his staff and he forbids Tara to phone Steed. Steed discovers the looking innocent window cleaners knows more about the stolen secrets.