Joan has been home the whole time, so she's been able to keep the phone on her person, waiting for the text. She's staring at the wall above the fireplace, where she's put up photos and documents and index cards with her thoughts written on them, when the phone goes DING! She immediately digs it out and sighs with relief when she sees the text from Leibniz. She goes upstairs into her room and makes sure the blinds are down and the door closed before she goes to her contacts...or, more accurately, contact...and hits call.

She can't wait to hear his voice again. She's missed it so much.