The Girl on the Train

The novel The Girl on the Train, which has sold more than 15 million copies worldwide, is a natural fit for the screen. It's a suspenseful, sexy mystery revolving around the type of charismatically damaged women that movies like Gone Girl and The Girl With the Dragon Tattoo call "girls." ("My husband says I'm the mistress of self-reinvention," murmurs one character early on, flaunting her Pilates-toned stomach.) The book itself could be repetitive and squalid, its cast of unsympathetic character...