A foppish Londoner working in British Intelligence, Alexander Eberlin (Laurence Harvey) is actually a Russian counter-espionage agent named Krasnevin. Fraser (Harry Andrews) head of British Intelligence, gives his men a special assignment - find and destroy Krasnevin! Gatiss (Tom Courtenay), a cold-blooded killer whos despises Eberlin but isn`t aware of his cover, becomes his aide. When Eberlin`s Russian Intelligence chief, Eberlin tries to escape to Moscow via West Berlin. Here even doubts Caroline (Mia Farrow), a swinging Londoner with whom he is having an affair.

Gatiss offers Sobakevich $100,000 for the identity of the elusive Krasnevin. When the Russian double-crosses him, Gatiss kills him. Then Eberlin learns from another British agent that Fraser has known his true identity as Krasnevin and has been using him to help unearth other members of the Russian ring.

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