Case Studies is a blog by alliterator. It involves a woman named Elizabeth Roth and her interactions with The Man in Gray.
It can be read here.
Elizabeth Roth works in a school and becomes concerned over the increasing amount of violence at schools, especially school shootings. She asks for opinions on why they happen and after one reply mentions a "man in a gray suit," she receives a package in the mail containing a gun. The gun has the word "INTERITIO" engraved on it and a note saying "ENDMAKER. MERCYGIVER."
Soon, she is visited in her dreams by the Man in Gray and finds that she is meant for something else... And other monsters are targeting her.
There are a few references to the Boomtown Rats' song "I Don't Like Mondays." The url is the first line of the song, while one of the posts is called "Tell Me Why," which is part of the chorus. Another post is about the case that inspired the song, when Brenda Ann Spencer fired on an elementary school. She was later asked why she did it and she replied, "I don't like Mondays. This livens up the day."