In this gripping mystery-romance series, a hard-hitting detective's life is turned upside down when his latest case takes a personal turn. As he delves deeper into the investigation, he discovers that he can move between parallel universes and must navigate two very different worlds to uncover the truth behind a series of murders. With the help of his colleagues in both universes, he races against time to track down the killer and protect his love. But as he navigates this dangerous and complex web of intrigue, he may discover that the truth is more shocking than he ever imagined. Will he be able to solve the case and find justice, or will the dualities of his life force him to make impossible choices?

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Some TV shows that have similar genres and were produced around the same time as Train include Sugar, Dark, The Night Manager, True Detective, Sherlock, Boy Swallows Universe.