In 'On the Other Side of the Tracks,' an unlikely duo of police officers, one from a posh neighborhood and the other from a poor suburb, must put their differences aside to solve a high-profile murder case. As they delve deeper into the investigation, they uncover a web of corruption and secrets that extends beyond the crime itself. With their contrasting backgrounds and approaches to policing, they must learn to work together and overcome their differences to bring the culprits to justice.

Diakité and Monge, two police officers with opposing traits, are paired together to uncover a large-scale criminal case. As they investigate the murder of Kevin Marchal and the white supremacist group Sons of Clovis, they discover a planned attack on religious sites. With time running out, they must stop the extremist leader, Antoine Brunner, and save innocent lives. Through their journey, the duo bridges their differences and strengthens their friendship, with one of them finally gaining recognition for their efforts.