What 2025 Netflix crime thriller series, an Argentine spin-off of "El marginal," follows a group of female inmates, led by Gladys Guerra, as they navigate the brutal realities and power struggles within La Quebrada prison?

The 2025 Netflix crime thriller series described is indeed "In the Mud (Review)," or its original Spanish title, "En el Barro." This Argentine prison drama is a spin-off of the acclaimed series "El Marginal," and it premiered on Netflix on August 14, 2025. The show centers on a group of female inmates, led by Gladys Guerra, as they navigate the brutal realities and power struggles within the maximum-security La Quebrada prison.

The series begins with Gladys Guerra, also known as "la Borges," and several other women being transported to La Quebrada. A critical incident during their transfer, where their police van is pushed into a river, binds them together as survivors. Upon arrival, these newcomers, often referred to as "Las embarradas" or "the muddy ones," must quickly learn to adapt to the harsh prison environment, facing adversity from the prison regime and the established "tribes" of inmates. Gladys, the wife of the criminal Mario Borges from the original "El Marginal" series, emerges as a key figure, using her intelligence and courage to navigate the complex social dynamics and power plays within La Quebrada.

"In the Mud" delves into themes of survival, alliances, and corruption within the prison system. The inmates must discover their own strengths and weaknesses to carve out their place and fight for their rights, all while trying to maintain connections with the outside world. The series has garnered attention for its dark and gritty portrayal of prison life, offering a compelling character-driven narrative that explores the transformation of these women as they strive to endure in a world where fear often rules.