"A story of sadness and serenity"
If ever I have read a book that moved me gently but to tears, that would be 'Stoner'. Akin to Stoner's happy days, I regretted the book ending so soon, but it could not come to a close at a better moment and the sadness that you will feel is going to be an acute one, which I surmised coming in waves and not continuously humming at the same pitch in 'Stoner'; the sadness will lap gently against you, you will be carried away. While pleasant dryness permeates Williams's writing, with the narrator's voice being attuned to it, there is little chance anyone could ever call it bland. If anything, this dryness intensifies complex emotions that the story evokes by acting as a counterweght, by keeping things mild, not overpronouncing them.
I hope you appreciate this book and if you do, you can try "The Heart Is a Lonely Hunter" by Carson McCullers that is of a similar sentiment.