West Point graduate lieutenant Jeff Knight meets cynicism when taking command of sergeant Michael McNamara’s tour veterans platoon in a Vietnamese trench camp. Unlike his predecessor, who hid till the end of his tour, Jeff takes charge, experiences the manual doesn’t allow coping with all realities and gets wounded. He returns, now fully respect by men and superiors. Besides the Vietcong, the platoon wrestles with the inscrutable villagers, which the G.I.’s officially protect, but also fear as some collaborate with them, other covertly with the Cong, either way subject to bloody reprisals.

An intelligent pulse of electricity is moving from house to house. It terrorizes the occupants by taking control of the appliances, either killing them or causing them to wreck the house in an effort to destroy it. Then it travels along the power lines to the next house, and the terror restarts. Having thus wrecked one household in a quiet neighbourhood, the pulse finds itself in the home of a boy’s divorced father whom he is visiting. It gradually takes control of everything, badly injures the stepmother, and traps father and son, who must fight their way out.