My favorite Book of a Musical is DO I HEAR A WALTZ? (1965), by Arthur Laurents and a Richard Rodgers/Stephen Sondheim score.
It's the story of a spinster teacher who takes a trip to Venice seeking fun, romance, and excitement... and gets exactly what she wanted and then some.
One of the first musicals with a bittersweet ending. It's available as a book--your local library may have a copy.
PLEASE check it out!!! :)
"I say YOU'RE the CUTEST one. No, I say YOU'RE the CUTEST One. And we go on like that from dawn to three."