This romantic drama focuses on Sally (Sheridan Smith) and Carl (David Morrissey), two morning commuters who develop a friendship after fighting for a seat. Though they are quite content in their relatively happy home lives, they become drawn to each other as their friendship evolves into flirtation. They refuse to admit - to each other or themselves - that a line might be crossed...and despite potentially catastrophic consequences, they can’t help but fall in love.

This romantic drama focuses on Sally (Sheridan Smith) and Carl (David Morrissey), two morning commuters who develop a friendship after fighting for a seat. Though they are quite content in their relatively happy home lives, they become drawn to each other as their friendship evolves into flirtation. They refuse to admit - to each other or themselves - that a line might be crossed...and despite potentially catastrophic consequences, they can’t help but fall in love.