The Lightest Darkness (2017) is a Thriller, Mystery film that follows when a neurotic private eye who struggles to finish the case takes a train voyage, his own dark secrets begin to reveal themselves. The Lightest Darkness is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 8.7 out of 10 from 3 votes. Fans of thriller movies may also want to explore similar titles below.