When a frightened young woman offers new information about the killin of the leader of a biker gang, the team agrees to take another look at the case--and perhaps prevent a second murder. A former colleague tells Sandra that she is wasting her career.

In 2006, when a zookeeper's body was discovered in the tiger enclosure, the death was ruled a tragic accident. New evidence now suggests it was murder. As the team tracks down clues, animal rights activist Brian clashes with the zoo's PR department.