Responses
I wouldn't day it's necessary,you can definitely read this without knowing everything from Night of the Unmarked however if you want to know context on the brother and his lovers story and about MCs teenage years I reccomend! Although the story isn't focused on him he plays a large side character role

Is it necessary for me to read 'Spirit of the Ghost' to understand the story better? Which one should I read first, or would it be fine if I just read this one directly?