Amber Tamblyn is set to join the low-budget psychological thriller Spiral.

The movie stars Joel David Moore as a reclusive telemarketer whose dysfunctional friendship with his boss (Zachary Levi) is alleviated when a whimsical co-worker (Tamblyn) enters his life. But as he begins to sketch his new friend's portrait, disturbing feelings from his past threaten to lead him down a path of destruction. Moore also wrote the screenplay with Jeremy Danial Boreing and will co-direct with Adam Green.

Tamblyn most recently starred in the ensemble chick-flick The Sisterhood of the Traveling Pants. She is best known for her starring role on the now-canceled TV show Joan of Arcadia.

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