Throw it in the trash? Honestly, this game is not one I would play again, it's just not interesting. The game just doesn't give enough to do for the investigators. Sure you can discuss among yourselves but for the most part you wander around the map yelling out numbers hoping one of them is a hit. The Jack side is a little more interesting but if the investigators are clueless as to where you are then it's a boring stroll back to your hideout.
Compare that to Fury of Dracula, if as an investigator, you are lost as to where Dracula is you can use that time to tool up. For Dracula, if the investigators are lost, you still are invested because you can lay traps or sire new vampires. It's a damn shame Fury is out of print because it is a much better game than Letters.
Sentinels is great. I would recommend grabbing the oversized villain cards. They are cheap and make seeing the villain from across the table so much easier. Also can't go wrong with picking up the extra characters, villains, and locations.