This is a letter found marking page 23 of Megan Penn’s diary. It was written with a fountain pen on a sheet of vellum, and was sealed with a dark red wax, pressed with a design which appears to be a skull when the broken halves are fitted back together.
“Welcome back. We see you’ve started settling in, and we’d like to take this opportunity to invite you to a gathering of your kindred spirits. On the last day of the month, go to the house at the end of 13th avenue, number 777. Come at midnight, alone. Present this letter at the door. We’re all dying to meet you.”