Alan Levine

The wife of a Marine serving in Vietnam, Sally Hyde decides to volunteer at a local veterans hospital to occupy her time. There she meets Luke Martin, a frustrated wheelchair-bound vet who has become disillusioned with the war. Sally and Luke develop a friendship that soon turns into a romance.

Matthew Bennell notices that several of his friends are complaining that their close relatives are in some way different. When questioned later they themselves seem changed, as they deny everything or make lame excuses. As the invaders increase in number they become more open and Bennell, who has by now witnessed an attempted 'replacement', realises that he and his friends must escape or suffer the same fate.