The CSIs investigate the mysterious death of a competitive eating contestant, and Chavez partners with Allie to prove where the mysterious silver ink notes have been coming from.

With Rachel left powerless, Dick turns to an old friend whose magic could be the key to identifying their mysterious enemy. Meanwhile, Conner and Tim investigate attack victims, and Sebastian finds himself at the center of an eerie plot.

Mel engages in a tense family reunion when she and her disapproving sister race against the clock to save their brother Edison after he’s abducted. Also, as the team unravels the motivation behind Edison’s kidnapping, Mel grapples with the fallout of her argument with McCall about training Delilah.

Unit Chief Jack Garrett and his international response team are called to Tanzania when a 23-member church group disappears.

Cruz finds himself in a bad spot when an off-duty incident begins to unravel, prompting Mouch to step in and offer help in hopes of avoiding serious consequences from the CFD. Casey goes head to head with a big politician to get his measure for first responders passed. Lt. Severide makes life difficult for newest team member Jason Kannell and Dawson gets an unexpected visit from her father.