Russia 1988. Telepathic twin brothers are chosen for a secret experiment to test ESP. Peter is isolated in a remote military station whilst Viktor is launched into space. The twins become mentally and emotionally close, until Peter intuits a dark secret his brother has kept from him. He abandons the mission. Alone, Viktor faces death in deepest space. Peter races back to save his brother. As Viktor drifts further into space, with light years between them, the brothers heal their bitterness and again become one.