One thing about the case has occurred to me; many stories that cover the moments after Valerie's attacker fled say the police reported that Dr. Hohf's wife saw no one to the rear of the Percy's home after the attack.
Having seen the property with at least some sections of the original structures still there, as well as what appears to be the Hohf's original house and property, one wonders what kind of vantage point Mrs. Hohf had, and whether she was really seeing the rear or front of the Percy's house. The Percy's property, which was actually three properties, was pretty expansive.
There wasn't that much space between the beach and the house (i.e. its rear/backyard.) Also, the patio where the killer made entry, and supposed exist, was pretty far north from the Hohf's house, which likely had a decent wall and/or hedges between. The pool house also was between the two houses, and it was sizable. Hohf's house isn't very tall, if I remember. So I'm not sure if she could have looked out a window. Of course, she may have come over part of the way.