Philbrick returns from vacation to find his house has been burgled. The comrades have broken in to check for any incriminating evidence linking him to the FBI.
Comrade Nycheck delivers a mysterious crate to be hidden in Philbrick's garage. It contains ten packs of TNT that the comrades intend to explode around the city.
Philbrick's cell decide to make a sacrifice. He must turn himself in to the FBI in order to take the heat off more important party member Colonel Paxton.
While collecting secret papers for the party, Philbrick hears that his wife Eva is sick in hospital. Distracted and concerned, he mislays the papers and so must retrace his steps to recover the documents.
Top commie Marvin Tanner has taken over the Aurora Newsreel Company. His plan is to send standard newsreels out to cinemas, but each one will have phony inserts containing anti-American propaganda.
A Russian army friend of Philbrick's from WW2 turns up in America. He is now a top Soviet official who wants to defect, but the comrades think otherwise.
Canadian commies in Ottawa send one of their comrades to Los Angeles on a phony passport. He is to spy on a guided missile site and Philbrick is assigned to help.
Key commie James Swasey is sent to prison for subversive activities. Fearful that he may divulge party secrets to reduce his sentence, the comrades assign Philbrick to arrange his execution.
In his capacity as committee chairman of the University Club, Philbrick welcomes a group of exchange students from Europe. The comrades, however, have arranged to employ one of the students as secret courier.
Philbrick accompanies refugees from Eastern Europe, Lottie Carp and her brother Peter, on an anti-Communist lecture tour of America. However, the reds have substituted Peter for a lookalike who plans to set up a spy ring.
Philbrick takes over the courier assignment of a mysterious heavy typewriter case. On the train journey he realizes that it's a napalm bomb that has gone into its countdown.
Ruthless Comrade Martha from Berlin tells Philbrick to deliver a bag of counterfeit dollars to a secret address. Whilst spying on the money he is locked in a secret room. How will he get out?
The party send Philbrick to the Central American Republic of Panagua where he will be expected to help Communist guerrillas overthrow the democratic government.
The party send Philbrick and wife Eva on the midnight train to Davistown, leaving their children at home with Eva's mother. When the mother in law comes across some Communist paperwork, she wonders whether to report her suspicions.
When the son of an important member of the German Communist Party requests asylum after stowing away on a plane from Germany to the United States, Philbrick is ordered by his cell to kidnap the youth and return him to his father.
Comrade Sonia lends Philbrick's car to another party member who then runs down a pedestrian. The police are after Philbrick, but what can he say to them?
Philbrick is asked to screen Steven Burke, a hopeful candidate for party membership. However, Burke has a secret that he wishes to keep from the comrades.
The Soviet secret police send over Comrade Anna to Philbrick's cell to organize some purges. The FBI manage to photograph her and discover she was previously a Gestapo exterminator at Dachau concentration camp.
Philbrick is asked to find a woman suspected by the FBI of stealing a nuclear isotope to sell to the reds. When he enters her house he discovers it to be filled with deadly radioactivity.
The FBI becomes suspicious of a pretty student in Philbrick's communist indoctrination course. Her fiancé is a scientist working on a top-secret project and federal agents are convinced that sweet brunette is stealing classified information and passing it to a contact in the class.
The comrades want Philbrick to help them infiltrate the Youth Group of America, but the strain of having a husband with three lives is becoming too much for wife Eva.
Philbrick's advertising firm arranges for famous athlete (and ex-commie) Barry Collins to go on a promotional tour for sporting goods. However, the reds don't want their ex-member to prosper as a capitalist and try to frame him for murder.
Disgruntled cell member Berrigan plots against cell leader Oswald and is condemned. His solution is to demolish the rest of the cell, including Philbrick, with dynamite.
Comrade Gayman dies of a heart attack during a cell meeting to plan the Communist revolution of a free foreign country. Left alone with a dead body, Philbrick must not only explain it away to the police, but also tell the FBI of the plot.
Heartless cell leader Comrade Karen orders Eva Philbrick to move location and leave her children behind. When Eva shows reluctance she is expelled from the Communist Party and husband Herb is ordered to leave her.
The comrades send Philbrick on a propaganda exercise behind the Iron Curtain at a Czech university. The party hope to influence young people by rigging an international essay-writing competition so that only Communist students win.
Philbrick's neighbour Mrs Hawkins discovers her son Steve is a Communist. How can Philbrick bring Steve to his senses without getting into trouble with his own cell?