When Felix arrived at Huddersfield Railway Station as a kitten, no-one knew how important she would become. She has a vital job as 'Senior Pest Controller' - but Felix is more than just an employee of TransPennine Express. She has changed her colleagues' lives and saved the day time and again: from bringing a boy with autism out of his shell to comforting a runaway child. 

When tragedy hits the team, they rely on Felix to pull them together. But it is a chance friendship with a commuter that catapults her to international stardom....