Mamie Gummer has joined Amber Heard and Jared Harris on the cast of Echo Lake Entertainment and A Bigger Boat’s psychological thriller The Ward, which John Carpenter is currently shooting in Washington State.

Heard plays a young woman who wakes up in a mental institution with no memory of who she is or why she is there, only to find herself terrorised by a ghost. Gummer plays a troubled patient who becomes an ally to Heard’s character.

Michael Rasmussen and Shawn Rasmussen co-wrote the screenplay. Glen Basner’s FilmNation is handling international sales.

Echo Lake’s Doug Mankoff, Mike Marcus and Andy Spaulding are producing with A Bigger Boat founder Peter Block.

Gummer’s credits include Evening and the HBO award-winning mini-series John Adams. She appears in Ang Lee’s Taking Woodstock that was just released in North America and is represented by Tony Lipp at CAA.

Carpenter has directed such films as Halloween, Escape From New York, The Fog, and Christine.