Can restrict information

"I need to find a child. She was taken by the Red Court a few days ago. We believe her to be somewhere in Mexico."
"Somewhere in Mexico?" Kincaid said, and I could hear his grin. "You tried walking around and yelling her name really loud yet?"
"I'm getting there," I said. "Look, does she know anything or not?"
Kincaid muffled the phone with something, probably his hand. I heard his low, buzzing voice as he asked a question. I might have heard a light soprano voice answering him.
Kincaid returned to the phone and said, "Ivy says she can't get involved. That the business you're on is deadly. She dares not unbalance it for fear of changing the outcome."
I made a growling sound. "Goddammit, Kincaid. She owes me one. Remind her who came and took her away from those fucking Denarian lunatics."
Kincaid's voice became quieter, more sober. "Believe me, she remembers, Dresden. But she isn't free to share her knowledge like you or me. When she says she can't tell you, she's being literal. She physically cannot let such information leave her head."
I slammed the heel of my hand into a wall and leaned on it, closing my eyes. "Tell her," I said, "that this is information I must have. If she can't help me, I'll be taking it up with other sources. The ones in my green notebook."
Kincaid spoke with someone again. This time I definitely heard Ivy's voice answering him.
"She can't tell you where the girl is," Kincaid said. There was a hint of steel in his voice, warning me not to push too hard. "But she says she can tell you someone who might."


Changes Chapter 19, Page 185