The emotional season three finale of The Sinner left viewers completely heartbroken.

However, Detective Harry Ambrose's journey is far from over. Bill Pullman, who has played the character since season one, opened up on his character's evolution in the new season.

"This journey with this particular troubled soul brings out his empathetic kind of nature to the extreme," Pullman said.

As the anthology series evolves, so does its characters. Cindy Cheung joined the new season as a series regular for the first time.

"I knew it as a show of great quality and intensity and to be able to have this be my first entree into being a part of a cast for a full season was definitely most thrilling," Cheung said.

Frances Fisher also teased the dramatic turn of events as the season unfolds.

"It's one of the most thrilling things I've ever been a part of because the writing is so complex."

The Sinner premieres Wednesday, October 13th, on USA.