The Open Door: A Ghost Story for Christmas by Margaret Oliphant

World-renowned illustrator Seth returns with three new Christmas ghost stories for 2020.

Retired officer Colonel Mortimer takes a lease on the mansion of Brentwood, the grounds of which share the ruins of an older house, including a strange, vacant doorway, but eerie events begin to unfold and Mortimer's son falls ill. As the supernatural takes hold, Mortimer resolves to do what he must to save his son even as he ventures further into an increasingly horrifying place.