Glass and horizon are both words about distance and fragility, and putting them side by side is a decent summary of what the speculative shelf does best. The Glass Horizon arrives with fantasy, science fiction and general fiction each claiming it, which suggests a story more interested in atmosphere than in the borders between genres.
Robert Meridien writes short. Under four hours is novella country, a length with its own discipline: no room for a slack middle, every scene has to earn its place, and the ending must arrive before the mood wears thin.
For a listener that is a low-risk invitation. An evening is all it asks of you.