It's the film about Clifford Irving, the guy who wrote the bogus biography of Howard Hughes and almost got away with it. The film stars Richard Gere and Alfred Molina. Here's a favorable review from Variety.
"The Hoax" fearlessly wades through the slippery psychology of a shameless liar -- the late writer Clifford Irving -- who sold a bogus "autobiography" of Howard Hughes to McGraw Hill and came close to pulling off the publishing scam of the century. Lasse Hallstrom's breezy, fast-paced, somewhat loose-ended account of how he did it offers a surprisingly layered vehicle for a maniacally conniving Richard Gere, backed up by a superb Alfred Molina as his accomplice. Though it marks a much-needed expansion of Gere's repertoire beyond the romantic lead he has continued to play well into his 50s, this complex loser's role marks pic as a marketing challenge for Miramax in U.S. release next April.