"Restless Solitude" is the story of young people who begin to perceive themselves in the context of their surroundings, though they cannot find an acceptable world within our civilized society. Instead of being accepted by a community, they see themselves as trapped in their adolescent dreams, because a world oriented exclusively towards material values cannot offer them an ideal place to live. Either one's spirit is broken when the individual is integrated into society, or the individual breaks with society. In both cases, the young adult is susceptible to seduction in a number of possible ways, eventually becoming a victim rather than a member of society.

Martin and Katharina’s marriage is at stake because their six-year-old son, Tobias, is autistic. They become friends with the young couple that moves in next door and Tobias starts to gradually open up. His parents are very happy. But soon Martin discovers that the young couple has their own reasons for wanting to be near Tobias: they have a horrible plan.