Granger sends the team to investigate the murder of a homeless man whom Granger says is a former marine and CIA operative who is known as the The Gray man because he doesn't exist. When they ask him why was he homeless Granger says he may have been suffering from PTSD. So they check him out but they discover he was not homeless. That's when they deduce that Granger was not telling them the truth. They track him down and discover he's meeting with another spook. The man tries to run but they grab him and tell Granger it's time for the truth. Granger says the man's boss said he dropped out of sight a month ago and didn't know what he was up to. They later learn the man was keeping an eye on certain people who may have ties to a Mexican drug cartel.