During each dinner, passengers will go "back in time to the 1920s to solve a murder on a three-hour journey" on the old-timey train while enjoying a multi-course gourmet meal. It's in wine country, after all, so there will also be plenty of vino flowing, which may help get you in the murder-solving spirit, or something like that.
Once aboard, passengers will take part in an experience set in the prohibition era, featuring 1920s mobsters, jealous lovers, a rival mafioso, and a pair of undercover federal agents, then work together to solve the crime by trading clues and information. And while period dress isn't required, it's highly encouraged you show up looking straight out of The Untouchables or Dick Tracy (tassel skirts, pinstripe suits, feather boas, fedoras, etc.). It couldn't hurt to also practice your best inquisitive furrowed brow reaction.