In the third season of True Detective, the central question is: who killed young Will Purcell? The story unfolds across three timelines —1980, 1990, and 2015 — and gradually reveals the tragic tale.
In 1980, Will and his sister Julie disappear. Later, Will's body is found in a cave, while Julie goes missing without a trace. Initially, the prime suspect is Vietnam War veteran Brett Woodard, but in 1990, new evidence emerges, casting doubt on his guilt.
The investigation leads to the Hoyt family, owners of a large corporation. It’s revealed that Isabel Hoyt, who had lost her daughter, saw Julie at a corporate picnic and believed the girl resembled her deceased daughter. With the help of assistant Junius Watts, she arranges meetings with Julie, paying the girl’s mother, Lucy, for the encounters. One day, Isabel attempts to abduct Julie, but Will intervenes, and during the struggle, he accidentally dies. Afterward, Julie is kept captive in the basement of the Hoyt mansion, living in isolation.

Thus, Will’s death was an unfortunate accident rather than a deliberate murder. The tragedy resulted from a series of wrong decisions and the concealment of the truth, highlighting the complexity and layers of the third season’s narrative.