Lizzie Borden, a favorite true-crime subject since long before the genre had that name, is the inspiration behind Fall River Fishing, a new play directed by Eric Tucker and written by two of its cast members, Deb Knox and Zuzanna Szadkowski. Their double duty as playwrights and performers doesn’t fully convey just how much Knox and Szadkowski, along with their three castmates (Susannah Millonzi, Jamie Smithson and Tony Torn), put into the show. It succeeds because of these five deeply invested performances, each actor playing two roles that require them to deliver absurdist, anachronistic dialogue and engage in physical gags like eating—and feeding each other—spaghetti with their hands, sitting on the toilet for an extended period of time and getting splattered with blood.