The 1959 film 'The Bridge' (Die Brücke) is a powerful anti-war drama from Germany, focusing on a group of teenage boys conscripted into the German army in the final days of WWII and tasked with defending a bridge. While not a crime thriller like 'True Detective,' it shares a deep exploration of human nature under extreme duress and the devastating consequences of conflict. It's a stark and realistic portrayal of innocence lost and the futility of war. The film's intensity and tragic narrative leave a lasting impression, though its genre differs significantly from the requested query.

While the 'Fargo' TV series is a more direct parallel, the original 1996 Coen Brothers film is a foundational piece of crime cinema that shares a similar dark humor and bleak, snow-covered landscape with elements of 'True Detective.' It follows a desperate car salesman who hires two hitmen to kidnap his wife, leading to a series of escalating, darkly comedic, and ultimately tragic events. Frances McDormand's Oscar-winning performance as Marge Gunderson, the pregnant police chief, is a beacon of decency in a world gone mad. The film's unique tone, blend of violence and absurdity, and strong sense of place make it a cult classic.

Stanley Kubrick's 'The Killing' is a classic noir heist film that, while not a TV series, shares 'True Detective's' intricate plotting and exploration of human fallibility. It meticulously details a horse track robbery and its inevitable unraveling, told through non-linear storytelling that was groundbreaking for its time. Sterling Hayden leads a cast of desperate characters, each with their own flaws and motivations. The film's tight script and innovative structure build a relentless sense of impending doom, showcasing how even the most carefully laid plans can go awry. It's a masterclass in suspense and character-driven crime.

'Mindhunters' follows a group of FBI cadets undergoing a training exercise on a remote island, where they must use their profiling skills to identify a killer among them. Directed by Renny Harlin, this film brings a classic 'whodunit' setup to a modern, high-stakes environment. While not a TV series, its focus on psychological profiling and the dark nature of the human mind aligns with the thematic elements often explored in 'True Detective.' The isolated setting adds an extra layer of claustrophobia and tension, making every character a potential suspect. It's a solid thriller that keeps you guessing.

'Luther' offers a darker, more psychological take on the detective genre, with Idris Elba delivering an electrifying performance as DCI John Luther. Much like 'True Detective,' it delves into the disturbed minds of criminals and the toll it takes on the investigators. Luther is a brilliant, but troubled, detective who often blurs the lines between right and wrong in his pursuit of justice. The show is known for its intense cat-and-mouse games, particularly with the enigmatic Alice Morgan (Ruth Wilson), whose relationship with Luther is one of the most compelling aspects of the series. It's stylish, suspenseful, and doesn't shy away from the macabre.

'Line of Duty' is a masterclass in intricate police procedural, perfect for those who appreciate the detailed investigative work seen in 'True Detective.' This British series focuses on a controversial police anti-corruption unit, AC-12, and their relentless pursuit of bent coppers. What makes it stand out is its commitment to realism, from the jargon-filled interrogations to the labyrinthine plot lines involving institutional corruption. Each season feels like a high-stakes chess match, with unexpected twists and turns that will keep you guessing. The ensemble cast is superb, and the writing is incredibly tight, making every episode a gripping experience. You'll find yourself questioning everyone's motives.

'Happy Valley' is an absolute powerhouse of British crime drama, and it shares 'True Detective's' gritty realism and complex character work. Sarah Lancashire as Sergeant Catherine Cawood is simply phenomenal, portraying a woman dealing with immense personal tragedy while fiercely dedicated to her job in a small, often brutal, Yorkshire town. The series is relentless, weaving together intense police procedural elements with deeply personal stakes. It's known for its sharp writing, unflinching portrayal of crime's impact, and powerhouse performances. The tension is palpable, and the narrative twists will keep you on the edge of your seat. This isn't just a crime show; it's a profound character study wrapped in a thrilling police drama.

'The Fall' is a masterclass in slow-burn tension and character study, making it a perfect fit for fans of 'True Detective.' Gillian Anderson delivers a tour-de-force performance as Stella Gibson, a detective superintendent tasked with catching a serial killer in Belfast. What sets this series apart is its dual narrative, offering an unsettling look into both the hunt for the killer and the killer's disturbing domestic life. Jamie Dornan is chillingly effective as the antagonist. The show doesn't shy away from the psychological toll of such investigations, creating a dark, atmospheric experience that will stay with you long after the credits roll. Its nuanced approach to gender dynamics in policing also adds another fascinating layer.

If you're looking for a show that dives deep into the 'why' behind the crime, 'The Sinner' is an absolute must-watch. Each season features a new mystery, often starting with a seemingly open-and-shut case that unravels into something far more complex and psychologically gripping. Jessica Biel's performance in the first season is utterly captivating, earning her a Golden Globe nomination. The series excels at building a pervasive sense of unease and keeps you guessing until the very end. It's less about the 'who' and more about the intricate, often tragic, motivations that lead to devastating acts. Prepare to be thoroughly engrossed!