A cop hugger has a terrifying near-passing experience in Dr. Tyler's OR. As Cat and her team investigate, they learn his horrible experience also might carry an important message from beyond.
Proof centers on Dr. Carolyn Tyler, a skeptical, hard-science, brilliant surgeon with a caustic edge who has been struggling with the devastating loss of her teenage son and a growing estrangement from her surviving daughter. She is persuaded to investigate cases of reincarnation, out-of-body experiences, hauntings - all of it looking for verifiable proof to answer one of life's greatest questions: Is passing truly the end, or is there something else beyond?