London advertising executive who calculates and selects a target for his boss. He pursues Marla among London's anti-war activists. After she is nearly killed and disappears, Fenn is suspected of murder, goes on the run, locates her at a country estate, and ultimately helps foil a conspiracy to assassinate a visiting African head of state in Hyde Park.
Initial antagonism driven by Tarquin's defense of Marla against Fenn's corporate pursuit.
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