Get Your Screwball On: The Girl in the Train by Agatha Christie
That's right, there's no typo in this episode's title: it's The Girl *IN* the Train, and we wouldn't have it any other way. Well, perhaps we would have a meatier mystery and more three-dimensional characters, but we couldn't help enjoying this simplistic and somewhat fantastical early thriller story.... Think of it as Christie on a busman's holiday, enjoying herself the entire way.