I hadn't heard of Sean O'Brien when I got this book as a gift, but it said on the blurb that he's a poet, and when you start reading, it shows.
His prose style is beautiful, concise, evocative and intensely personal - poetic in fact, and there are lots of references to poetry and poets, many of whom I didn't know. I wondered if some of them were fictional, but I'm far too lazy to check.
It's essentially a book of short ghost stories, with assorted themes connecting them. This kind of book is difficult to pull off without seeming contrived, but he got it spot on most of the time, using repeated themes and images to insert resonance into the pieces and sometimes to add an extra level of meaning and understanding.
So it was a moving and beautiful work, if a little disjointed, very much like a book of poems.
The reason it doesn't get five stars, despite its many great strengths, is that it often seemed deliberately vague, almost wilfully opaque. I felt I wanted more story and less imagery.
However, it's definitely worth a read if you're a fan of the classic English ghost story, or if you have ever felt at home in a library. I caught hints of M. R. James, William Hope Hodgson, Algernon Blackwood and many similar greats from the past, and, just once or twice, it completely enfolded me and made the real world disappear.