First floor walk in violent abduction by released violent psycho who had been lurking in the neighborhood.
Second floor "hot prowl" through house by neighbor who was at the bar (at least) with Brenda shortly before the abduction.
Mark Klaas was not locked in the garage getting stoned, with unkown "swingers" in and out of his house.
My addition....not to mention the fact that the alarm system had recorded an intruder and Mr. or Mrs. VD turned it off and did not check on their daughter.....