Plot summary
The latest number is Tomas Koroa ( Gerardo Celasco ), a wine dealer who is also an international thief. Shaw joins his gang. They rob a safe, which unexpectedly contains a deadly virus ( Marburg, or "MARV"). The other members try to kill Tomas. Shaw intervenes, but they take the vials. Shaw tracks the virus to a secure storage facility and realizes that two government operatives are doing the same thing. One of them is her former apprentice, Devon Grice ( Nick E. Tarabay ). Shaw and Tomas break into the storage facility, but are confronted by one of Tomas' teammates, who was behind the virus theft in the first place.
They escape with the vials, but Grice apprehends them. He lets them go, deleting the CCTV video. Samaritan retrieves the video and starts repairing it. Root and Finch investigate software engineer Jared Wilkins, founder of new nonprofit OTPS, who received a $12 million grant from Governor Dawson (from " Prophets "). OTPS is an effort to give every New York student a tablet for educational use. Believing the tablets to be powered by Samaritan software, they plant a virus which ultimately destroys the building.
Credits
Adapted from Wikipedia contributors, Person of Interest season 4. HTML formatting and reference markers removed.