Written in the 70s, Reduction in Arms posits a near future in which the US and USSR have agreed a nuclear non-proliferation treaty. Inspectors from the US can tour facilities in the USSR unannounced, and vice versa. A US inspection team notes a missing Soviet scientist has been seen at an installation near Moscow and arranges an inspection - the Soviets are reluctant to permit the team inside and the installation goes into lockdown, thereby causing an international crisis...
Rather gripping throughout, Purdom's sadly obscure novel does not portray the Soviets as the villains of the piece, rather it is an examination of the frailties involved in national security on both sides.