The latest social security number the machine spews out is that of teenager Theresa Whitaker. The problem is that Theresa was supposedly killed two years earlier in what was deemed a murder/suicide of her entire family on a boat, the killer being her father, Grant Whitaker. However, Theresa's body was never recovered, presumed drowned and swept away by the current. Reese quickly discovers that it wasn't a suicide, but rather a contract hit. They have to figure out who contracted the hit and why, and why they didn't kill then fifteen year old Theresa. They also have to figure out if the hit had any connection to Grant's now supposedly grieving brother Derek and/or Derek's ex-wife, Elizabeth. But first, they have to find Theresa, who probably has trust issues having been underground for two years. Because of her situation, Finch has a certain empathy for this case. Meanwhile, Finch recalls telling a disbelieving associate of the back door into the system. And Carter hits a stumbling block in discovering who Reese is as all his records have been redacted.