Well, you've got the obvious two: Georgia Stanton, the contemporary romance writer trying to piece her life back together after a divorce, and her grandmother, Scarlett Stanton, whose World War II love letters kick everything off. But honestly, the real heavy lifting is done by Noah, Georgia's ex-husband turned editor, and Jameson, the historical researcher she's forced to work with. Those two men—Noah with his frustratingly perfect memory of their failed marriage and Jameson with his clinical skepticism about Scarlett's epic love story—create the friction that makes Georgia question everything.
Then there's the WWII timeline, which hinges on Scarlett and the pilot, Edward 'Bill' Ashford. Their whirlwind romance is the book's beating heart, but it's painted through this dual lens of Georgia's idealization and Jameson's doubt. You're constantly wondering whose version of the past is true. The most interesting character to me is actually the unfinished manuscript itself—it's this silent, pivotal presence that forces everyone to confront their own messy histories.