Paula Hawkins’ The Girl On The Train has been a huge hit as a book, so it’s not surprising at all that Hollywood has picked it up and is making a movie. The film is chugging forwards quickly, wth Emily Blunt in the lead role and Justin Theroux, Rebecca Ferguson, Édgar Ramírez, Luke Evans, Allison Janney, and Lisa Kudrow co-starring.

The book follows ‘Rachel, [who] takes the same commuter train every morning. Every day she rattles down the track, flashes past a stretch of cozy suburban homes, and stops at the signal that allows her to daily watch the same couple breakfasting on their deck. She’s even started to feel like she knows them. “Jess and Jason,” she calls them. Their life—as she sees it—is perfect. Not unlike the life she recently lost.

‘And then she sees something shocking. It’s only a minute until the train moves on, but it’s enough. Now everything’s changed. Unable to keep it to herself, Rachel offers what she knows to the police, and becomes inextricably entwined in what happens next, as well as in the lives of everyone involved. Has she done more harm than good?’

The novel has been compared to Gone Girl and also has shades of Agatha Christie’s Miss Marple tale, 4.50 From Paddington. For the movie the action has been moved from Britain to the US (although Blunt will still be British). Tate Taylor (The Help) directs, with the movie due out next summer.