Lost count of the arguments I've had about this - I suppose it's a sort of "I couldnt tell you what it is, but I know it when I read it" .............. ?
For example, I would put Flora Robson's "Lark Rise" trilogy there, but her "little" books are so much more, beautifully crafted social history and comment for a start.
But I would , I think, also put Lee Burke there, despite the usual classification of his chosen genre, due to the sheer quality of writing, the strength of feeling that emerges for his home, the skill and accuracy of his attacks on the Establishment, and more....
Conan Doyle did OK, after all.......
But I do sometimes feel writing is classified as literary if it either gets accepted into a "Lit" competition, is over 80 years old, or we are
told it is by someone who everyone thinks should know ! Apart from everything we sort of morphed into accepting as "Lit" thanks to our schoolteachers.
And never touched again afterward because of it.............
But, we all love doing it, so I'll go a bit left field and timorously suggest Robert Wilson's "A Small Death in Lisbon" , and, even more hesitantly, "The Sleeper" by Paul Adam, a fascinating glimpse into the world of rare violins. ( Sadly, I don't know if it's been ebooked yet. But it's a really good read anyway.......
)