. >> in january, steven avery plead d not guilty and ken krats began chronicling his case. >> what do feel people know the least about in this case? >> the book is about steven avery that is setting forth a better representation of what the real evidence was. >> better, he says, than the way the evidence was presented in "making a murderer." for the first time, krats lays out his theory with new details he's never shared before. for one thing, krats tells "dateline" he believes steven avery had set his sights on teresa halbach in the weeks leading up to her murder. >> as we move closer to october 31st, we see steven's behavior changing. >> as krats got auto trader's record, he learned teresa had made five earlier visits to the age yard to take photos, some at steven avery's request. >> hetarts making calls directly to teresa halbach. >> and krats determined on the day before one of these visits, avery purchased these shackles and handcuffs. >> when teresa arrives -- >> he answers the door wearing a small white towel. and teresa, we know is creeped out by that behavior. she tells frien