The Trinity Case is a police investigation into a cycle of killings of a ten year-old boy encased in cement, a twenty year-old single woman killed in her own bathtub, a forty year-old mother of two forced to jump from a tall building, and a forty year-old father of two beaten to death. The case in itself is the sixth major case in the series. The major case preceding this case is the Lundy Shooting and the next major case after this is the Santa Muerte Case.