Sources say that as of now Pattinson is only on board to produce, not star.
The package just hit the market with several buyers vying for rights.
Finn will also pen the script.
(L-R) Robert Pattinson and Parker FinnGetty Images
Pattinson is producing via his production company Icki Eneo Arlo along with Vertigo Entertainments Roy Lee.
The original pic follows a woman who begins exhibiting increasingly disturbing behavior after asking her husband for a divorce.
Suspicions of infidelity soon give way to something much more sinister.
Finn is repped by CAA, Grandview, and Jackoway Austen.
Pattinson is repped by WME, 3 Arts Entertainment, and Curtis Brown Group.
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The Hollywood Reporterwas the first to break the news.
