What is the importance of the Harker's home in the novel, Wilder Girls?

The Harker home is located a short distance from the boarding school. It is where Daniel and Reese Harker live. Hetty notes that the house is neat and inviting when Reese invites Hetty and Byatt for dinner one evening, but it is overgrown and falling apart just a year and a half after the Tox strikes. This is the place Miss Welch and Taylor leave a Mona's body, and is where Hetty and Reese have to kill Mr. Harker after he attacks them.