I‘m going with the Homeric Hymns (here translated by Jules Cashford). Because they‘re delightful and somehow no one seems to read them.
Other H‘s, each a candidate for a different reason: Hamlet, The Haunting of Hill House by Shirley Jackson, Hot Milk by Debra Levy, The House of Mirth by Edith Wharton, How to Be Both by Ali Smith
#Alphabetgame #LetterH @Alwaysbeenaloverofbooks