Ep 17. Locard's Exchange

In Crossing Jordan season 4 episode 17, titled "Locard's Exchange," the team investigates the death of a college student who was found strapped to a mattress and covered in a sheet. As they work to solve the case, they discover that the victim had been involved in a dangerous game called "Locard's Exchange," where participants exchange DNA samples with each other in order to see who can create the strongest immune system.

Meanwhile, Dr. Macy is still struggling with the aftermath of his daughter's death and is having trouble coming to terms with his grief. He finds solace in the relationship he has developed with photographer Julia Winston, but his emotional state proves to be a barrier in their budding romance.

As the investigation into the death of the college student unfolds, the team discovers that he had been involved in a secret society on campus that had ties to the "Locard's Exchange" game. They also learn that one of the victim's classmates had been experimenting with biological weapons and had been kicked out of the secret society.

The investigation heats up as the team races to find the killer before more lives are lost. They uncover a plot involving the creation of a super-bug and the use of dangerous biotechnology.

As Dr. Macy struggles to keep his emotions in check, he becomes more involved in the case and works closely with Detective Woody Hoyt to solve the crime. Along the way, the team faces numerous challenges and obstacles, from hidden labs to secret meetings.

In the end, the team is able to solve the case and bring the killer to justice, but not before Dr. Macy is forced to confront his own grief and mortality. The episode ends with the team reflecting on the dangers of playing with science and the consequences of crossing ethical lines.

"Locard's Exchange" is a gripping episode of Crossing Jordan that explores the complex world of biotechnology and the risks that come with playing God. The episode is filled with suspense, intrigue, and emotional depth, making it one of the standout episodes of the season.