No types of ambiguity

Duncan was been a wreck all yesterday. At lunch he said that his father's gone, and he and his mother didn't know where he was. He was really worried. I told him I'd call him later (he said he was going to stay home with his mother) after Charles Wallace and I had dinner.
We had a quiet night in. I talked to Duncan, and Charles Wallace played Sims. Around 4:00 a.m. the phone rang. I answered and got the Bell computer saying there was a collect call from Charlotte Brontë. I accepted the charges and asked Arne what was going on.
"How did you know it was me?"
"Lucky guess. Well, what is it? You know that Mom and Dad are in Montreal..." Arne cut me off.
"I know. Don left you the envelope, didn't he? I need the envelope! How fast can you get here?"
"You mean, to Niagara Falls? We'd have to go by bus, you know."
"However you can get here--it's important. "
"All right. But how can I contact you once Charles Wallace and I get there?" Arne gave me a cell phone number ("make sure you ask for Violet Agarn when you call") and hung up. I had trouble going back to sleep after that. Luckily Charles Wallace tends to wake up early. He went to work looking up the bus schedule. It looks like we'll have to go on the sightseeing/casino bus that leaves from in front of the convenience store at Mayes Motors. Maybe Duncan would like to go along to get his mind off things.