In the beginning there were three people in the house, two men and a woman. When the shooting starts, the woman gets shot, but all three, as we find out later, managed to escape. Years later the woman who got shot is now the crippled neighbor, her husband is the prowler/killer, and the third guy turns out to be the creepy realtor. Now all of this is based on the pretext that all three managed to escape from the house all while law enforcement officials are blasting away with pistols, shotguns, and submachine guns, which seems preposterous. And not only did they escape but they stayed in the area, changed their identities, and managed to live undetected among the same folks they lived with before they got evicted.