 Tuvok investigates the murder of a Voyager engineer. Former Maquis and Betazoid Lon Suder (guest star Brad Dourif) confesses to the murder and offers no explanation or signs of remorse. Tuvok, curious to find a reason for Suder s madness, performs a mind-meld on the killer, only to find himself losing his usual Vulcan control and regressing into madness.