I actually don't think Chloe's step-dad is a freak/ass/stalker but trying to crack his own mystery.... but feel free to quote, point, and laugh when if proven wrong
Yo I totally agree. I think he's misunderstood and kind of hardcore with the surveillance and suspicions. BUT, he's the only character (other than Max and Chloe) that appears to be doing anything at all about finding out what happened to Rachel.