I enjoyed the story and especially found the narrative voice to have a clear, easy flow, but like fiveyearwinter, I felt the ending was abrupt.
I also appreciated how the mc's nature was slowly revealed, which foiled my initial expectation that he was the fun, good guy you root for, like John Cusak on spring break in a romantic comedy. It was a pleasant bit of trickery. But after spending the majority of the story in a 3rd person, limited POV focused on him, I was a bit put off shifting, suddenly, to the guardian's perspective, and that trick felt less pleasant, like hustled at 3-card monte. It reminded me how often horror tales hinge on that last minute twist, and how delicate an operation it is: show too much and readers know it's coming, but don't show enough and it feels unearned. Lorna leaned towards the latter for me, but like I indicated before, I enjoyed the story up to that point, so kudos to Mr. Stuart.