So I recently picked up 'The Mark of Cain' after seeing it mentioned in a few mystery forums, and the characters really stick with you. The core is definitely the estranged Shelby brothers, Cain and Abel. You'd think with those names it's obvious, but it's way more nuanced. Cain's this cynical, hardened ex-con who served time for a crime tied to their past, and Abel's the seemingly perfect pastor with a hidden streak of rage. Their dynamic drives everything.
Then there's their childhood friend, June, who's caught in the middle. She's not just a love interest; she's practically a third sibling with her own guilt and secrets, especially about the night everything went wrong. The local sheriff, an older guy named Hollis, keeps poking at old wounds, and he's got his own reasons for never letting the case go cold. The cast feels real because nobody's purely good or evil, just messed up people shaped by one terrible event.