“Scully, have you ever asked yourself what kind of man would quit his job, leave his family, follow you across the country, and never contact you the entire time he was here. Never once, in ten years, did he call you, or write you, or contact you in any way. What kind of man is that, Scully?”
Daniel is a creepy stalker, and lives are at stake. This is a wonderful thriller based around Scully's ex, set at the end of the seventh season.