The damning evidence is mounting up against a 58-year-old Bucks County man who authorities there say is a serial child rapist, preying upon girls ages 2 to 10 with victims dating back as far as 40 years.

Among the evidence is more than 1,000 pairs of little girls' underwear hanging from the ceiling of suspect William Charles Thomas' home, according to CBSPhilly.com, which adds:

Investigators say he indicated he would steal the underwear when he did work in homes, and then would stalk the victims.

Our sister website, LehighValleyLive.com, reports Thomas was charged Monday with five counts of child rape, but likely assaulted many more, according to Falls Township police.

In addition, the trailer-park handyman faces charges of possession of child pornography and dissemination of photos and films depicting child sex acts, according to court records.

The break in the case from a contractor found a piece of plywood in a trailer with hand-written descriptions of assaults on two girls, ages 3 and 6-and-a-half or 7, CBSPhilly.com writes.

The discovery in a trailer home in the Midway Village Trailer Park in Morrisville, Pa., was connected back to Thomas, who had done work on the trailer in the past, the news station reports.

That led police to Thomas's home, where they say a mountain of evidence was found including all those pairs of girls underwear, which Bucks County District Attorney Matt Weintraub "a perverse shrine to his criminal conquests."

But Lt. Henry Ward of the Falls Township Police Department had a more difficult time articulating what the suspect's home was like, according to CBSPhilly.com:

"The human race hasn't come up with words to describe what we saw in that trailer. This is a parent's worst nightmare," he said.

The closest description might be a real-life boogeyman.

But as LehighValleyLive.com writes, neighbors who live in the trailer park said they knew Thomas as "Willie," a helpful handyman who displayed no prurient interests around little girls.

Yet, police allege he began assaulting children dating to the 1970s, but the specific charges in the case date from the 1990s until last Thursday.

Thomas was lodged in Bucks County Prison at last report.