Clark nodded. “She attends a special school in Superior for developmentally disabled children. My wife takes her there during the week.”

“You and your wife are divorced?”

“Yes, I have Mary on the weekends. Donna takes her during the week.”

His face twitched. It was a sore subject.

“May I have Donna’s address and phone number? I’ll need to talk to her.”

Clark recited them. “I haven’t called Donna to tell her what happened. She’s coming by in the morning. I want to let her know in person.”

“I won’t talk to her until you do.”

He nodded.

“I’m sure Sergeant Guppo asked you some of these things already, but please bear with me,” Maggie continued. “Have you noticed any strangers near your house recently? Have you seen any parked cars in the neighborhood that you didn’t recognize?”

“Not that I can remember.”

“Has anything unusual happened involving Mary lately? Or has your wife mentioned any problems with her during the week?”

Clark shook his head. “Nothing out of the ordinary.”

“Does Mary interact with many other girls outside school?”

“No, she’s mostly with Donna or me.”

Maggie nodded. “I’d appreciate it if you could write up a list tomorrow of the people that Mary regularly comes into contact with. Men and women. People at school. People at your workplace or your wife’s workplace, if she ever goes there. Anything like that. Because of her condition, Mary’s universe is substantially smaller than those of the other girls who have been peeped, which may make it easier for us to find an overlapping connection with the other victims.”

“I’ll get you a list,” Clark said.

“This is an awkward question, Mr. Biggs, but can you tell me more about Mary’s intelligence level? Do you think she would recognize the man who peeped her? Or could she pick him out of a lineup if she saw him?”

“She’s not stupid,” Clark snapped. “She’s just disabled.”

“I wasn’t trying to offend you. I just want to know if she could be a witness for us.”

“I don’t know whether she saw this guy’s face, but Mary remembers things. If she saw him, and you show her a bunch of pictures, she’ll pick him out. I’ll never let her inside a courtroom, though, if that’s what you’re thinking.”

“I understand. Would you mind if I had an officer bring a photo book of registered sex offenders in this region? For Mary to look through?”

“I don’t know if I want to traumatize her like that,” Clark said. “If she sees him in there, she’s going to be scared.”

“That may be the only way to find him.”

Clark sighed. “Okay. I want to be there, though.”

“Of course.” Maggie added, “I’d like to come back and talk to Mary, too, if you don’t mind.”

“She’ll be with Donna. You’ll have to clear it with her. I have to tell you, I’m not too crazy about the idea. You’re not going to get anything from her, and I don’t like her talking to strangers.”