He’s also an explosives expert working for the Soviet-backed International Brigades in the Spanish Civil War (1936-1939). He is given secret orders to destroy a vital bridge behind enemy lines. After meeting with the local guerillas, he makes his plans over the next three days while falling in love with a young woman (rescued from the Francoist fascists), contending with a guerilla leader who doesn’t want to cause more problems for himself, and facing the insurmountable odds arrayed against him.