The film stars Allison Janney, Jurnee Smollett, Logan Marshall-Green, Ridley Asha Bateman, and Matt Craven.

Hannah informs Lou that the hitchhiker is Vee's father, Philip, a former Green Beret and war criminal she thought was dead.

The camera shifts to show a woman's arm with a similar scar that Lou had and a copper bracelet, as she watches Hannah and Vee through binoculars.

The website's consensus reads: "From a storyline or set piece perspective, Lou doesn't add much to the action genre -- but it does serve as a generally entertaining reminder that Allison Janney is not to be trifled with.

[2] Jeannette Catsoulis reviewed the film for The New York Times, saying, "Unfazed either by the working conditions or by Maggie Cohn and Jack Stanley's ridiculously over-the-top screenplay, [Janney] lends her grouchy character more than a ramrod spine and steely stare.

"[6] In another positive review for the Los Angeles Times, Noel Murray writes, "The mystery of who Lou is and why she takes an interest in Hannah isn't as surprising as the movie makes it out to be; but Janney is so commanding as an unlikely action hero that the picture still works.

"[7] John Anderson of The Wall Street Journal said, "Sometimes you just want a crazy action movie to kill an evening, and "Lou" fits that bill.

"[8] Lou was also praised by IGN's Tara Bennett who called it "a tight, gripping thriller that opens up a whole new genre for the ever-fabulous Allison Janney.

"[9] In a negative review, Brian Tallerico of RogerEbert.com writes, "Allison Janney proves with Lou that she could carry an action movie.

"[10] In another negative review, Benjamin Lee of The Guardian awarded the film with two stars out of five, criticizing the plot of Lou, calling it's twist as "dull [and] derailing that complicates and confuses, turning what could have been a tight little chase movie into something far baggier and far harder to get involved in.