A pickpocket dies of anthrax poisoning, putting Holmes and Watson on the trail of the toxin’s source in order to prevent more deaths.

In a flashback to 10 years prior, Wendy struggles with depression, Del asks Marty to be his financial adviser, and Agent Petty faces a family crisis.

Maggie and OA hunt down a ruthless group of robbers who are posing as police officers to target armored trucks.