The team initially suspects a black-market adoption ring. However, the profile shifts when they realize the killers are a married couple, Robert and Linda Reinman, who lost their own baby, Michael, due to a medical tragedy.
This episode is frequently cited in horror discussions for its claustrophobic "basement" scenes and the clinical, cold nature of the villains. [S5E5] Cradle to Grave
The couple is trying to "replace" their lost son. They keep the male babies that meet their specific criteria and discard the mothers and "imperfect" infants. Why It’s Notable The team initially suspects a black-market adoption ring