The note can be found in Harpers Ferry, on a desk in the church.
Something must be done about Daniel Whitby. That man is clearly carrying a disease and he needs to be removed from Harpers Ferry before we all become infected!
Have you seen his skin? His hair? He's changing into a monster and unless we exile him, we're all going to end up looking that way. Send him packing right now, or force Ella and Maria to drag him back to the Responders' HQ in Charleston. Whatever it takes.
He's a ticking time bomb, Eddie. Don't wait until it's too late.