ivyblossom's
Buried is actually the third story in a trilogy which posits a relationship between Edmund and Bacchus, but I read it without reading the former two, and it felt fine to me. It takes place in the ordinary world of England, during
The Last Battle when Peter and Edmund search for the rings. Edmund's ambivalence toward Narnia and his own post-Narnian life is intriguing -- there's a lovely sort of disquieting mood pervading the whole story, even though nothing much happens in it.
I think this Edmund is a bit older than I picture him being in TLB (he's only meant to be a year or two older than Eustace, who was still a schoolboy in TLB, right?), but if you can get past that, it works.