Emily is driving her dad's car and texting, and as she's not paying attention, she happens to clip a woman. Emily tries to help the woman, who seems very disoriented and claims that someone named Charlie wants to murder her. Cal is sympathetic to Veronica, and seeks to help her out.
Veronica has early on-set Alzheimer's and Cal figures out that she has guilt over her sister's death in 1968. Later, Cal and the team investigate the care home where Veronica lives, and discover that the man called "Charlie" is actually on the staff at the facility.
Charlie has been mercy-killing patients and Veronica fled because she believed she'd be next. In order to catch the killer, Eli poses as a coma patient. When Charlie arrives to pull the plug, he's caught by the team.