Watch Crossing Streets for Free: How to Stream the Movie Online at 123Movies. . Marcus Williams is a city detective who is unwillingly thrust into a partnership with Minister Samuel Gray to solve a gang-related shooting. As the mismatched duo begin their journey, they soon discover the incident is part of something bigger, and catching the killer means stopping an all-out gang war. Through the investigation, Marcus and Samuel both learn that saving lives means learning to work together in this buddy cop dramedy.