The plot twists and turns, or lack thereof, are visible from a mile away in the Circa '21 Dinner Playhouse's production of Route 66. This boy-meets-girl musical has few surprises, and the outcome is abundantly clear from the moment Erin Churchill's aspiring writer Liz meets Kenton Fridley's freewheeling photographer Drew; they're like oil and water, but you know they're going to blend in the end. Even so, Circa '21's romantic comedy is a delight, boasting endearing charm in spades and one catchy tune after another.