The officers of the Special Branch mount a dawn raid on the homes of the members of a suspected spy ring.

Cowley suicides shortly after an unproductive round of questioning by Eden in gaol, which leads to an embarrassing public coroner's inquest. Jordon investigates a scientist being vetted for a sensitive position and all agree he's too far left for further consideration, yet he still succeeds.

A small boat arrives at a beach in Kent where illegal aliens are unloaded, but the police bag the smugglers and all bar one of the Pakistanis, now quite ill, who seeks refuge with an immigrant rights activist.

A teenager's vow of vengeance leads to Inspector Jordan interrupting a wedding and Superintendent Eden accepting a parcel that contains death. Before the day is over both men have cause for concern.

Informed that the manuscript of a Russian author's novel which has been smuggled into Britain is a forgery and could discredit the Goverment, Inspector Jordan goes against orders and investigates the claim.