The movie is based on a book by author Janet Evanovich and unfortunately, that's really the only remarkable thing about this movie. Yet again, Heigl has put her hand in a completely run-of-the-mill "mystery" movie. Heigl puts up a particularly barely-there performance. Sometimes she puts on a awful Jersey accent, other times it miraculously disappears. The entire time she seem bored with the whole plot. Which is pretty understandable.
Again, sorry for the short review, but... there really isn't anything more to say. One for the Money is as bland, predictable and annoying as any other Katherine Heigl movie. Nothing sets this one out from the crowd and is probably best forgotten. One for the Money gets 2 stars out of 6.