The "Messages" section gives some exchanges between Jess and Clara, Jess and Colton, and Jess and Addison; they're mostly just funny (especially the ones with Clara, who can't figure out how to disable her phone's predictive text function), but well worth reading all the same.

The "Journal" section is a series of audio recordings made by Jess and Addison the night she disappeared. Listen to them all; they get pretty scary near the end, but you need to hear them all.

When you've played all the recordings, you'll have a whole raft of new things to investigate. What fun!

Where are the floor boards where Addison dropped something?

Where are the ruins where Charlotte died?

Where is the window with the message?