Libby (ASHLEY JUDD) and Nick Parsons (BRUCE GREENWOOD) seem to have a decent marriage and a happy family life that includes their young son, (BENJAMIN WEIR). Yet in the middle of an unexpected but romantic sailboat cruise, Libby awakens to find herself and the boat covered in blood and Nick missing.
Despite the efforts of her lawyer, Bobby Long (JAY BRAZEAU), the fact that Libby was discovered holding the bloody murder weapon and that she's the beneficiary to a two million-dollar insurance policy convinces the police and a jury that she's guilty and thus is sent off to prison. Having entrusted the care of Matty to her best friend, Angie Green (ANNABETH GISH), a local school teacher, Libby begins what turns out to be a six-year sentence.
There she meets fellow inmates, Evelyn Lake (DAVENIA MCFADDEN) and Margaret Skolowski (ROMA MAFFIA), the latter of whom is a former lawyer who gives Libby an important piece of information. Since Libby has discovered that Angie has run off with Matty and more importantly, that Nick is still alive and with them, Margaret reminds her of the double jeopardy clause. Since she was already convicted of murdering Nick and is doing time for that, upon her release she can find and kill him, and not worry about being charged with the same crime twice.
Upon her parole where she has to report to her gruff and no-nonsense parole officer, Travis Lehman (TOMMY LEE JONES), a former law professor, Libby sets out to find Nick, possibly kill him, and retrieve Matty. After she breaks her parole and heads across the country in search of Nick, Lehman tries to find and stop her before she does anything she'll regret.