What's a modern theatrical production to do with a story most everybody knows by heart? Playwrights Steve Rosen and Gordon Greenberg have decided that if some familiarity is good, then more is better, and set Scrooge's story right where the theater stands today. They keep the setting in olden-days 1919, the better to preserve the mutton-chop facial hair, the top hats, and the lack of furnace heating. But they're happy to go present-day for the sake of a joke. They're happy to go all sorts of places: meta, silly, clever, even weird. But while you can play Tiny Tim for laughs by making him a puppet with a live, adult human head — just one clever bit of prop work in a production that makes the absolute most of a few crates, chairs, ladders, and window casings — there's only so much humor a show, even a feel-good show, can get from the plight of a dying child. Or, for that matter, from the haunting of an old man's loveless heart. It's to the cast's great credit that they are able to execute the massive shifts in tone when the rim-shot rat-a-tat of jokes must give way to the story's pure feeling without giving the audience emotional whiplash.