The series follows two detectives as they work various cases, and will reportedly feature new central characters each season.
The teaser clip, which debuted Sunday during the season premiere of Boardwalk Empire, introduces Det. Rust Cohle (McConaughey) and Martin Hart (Harrelson), who are tracking a serial killer in Louisiana.
"This is a world where nothing is solved," McConaughey's character says.
True Detective premieres in January 2014. Check out the trailer below. Will you watch?