The plot is non-linear, so the audience gets mixed messages about what the plot actually is. Basically, it follows the grisly connection between a math professor, a widowed drug-addicted mother, and an ex-con trying to reform but with a rough edge to him. Romance tinges this drama.
Trivia: The experiment that showed that humans lose 21 grams at the moment of death were later shown to be highly flawed. The entire experiment was based on only four people. Only the first subject actually lost 21 grams. Another person lost a different weight, and the other two died before they could be properly weighed.Phoenix