Here's a followup to an earlier post about a third phone call in Nancy Drew: Treasure in the Royal Tower.
The way to trigger the phone call is to start a fight between Lisa and Nancy, so Lisa will refuse to talk to Nancy anymore. I have no idea HOW you make this fight happen. The Her Interactive boards indicate it happens during your conversation with Lisa about the library. And, um...I've never had a conversation with Lisa about the library.
Any ideas how to do that? Someone else said you can talk to Lisa about exploring Hotchkiss' room, and that's another conversation I've never had with her.
Anyway, since Lisa won't talk to you, the trigger for the "medallion in shed puzzle" gets changed to Lisa leaving you a voicemail, as opposed to the normal way, of Lisa telling you directly.