Lou lives alone with her dog Jax. She is shown to be burning some official looking papers, sharpening her knife and cleaning her guns. She is preparing for something. She is shown to be attempting a suicide, by pointing her own gun at herself.The film starts earlier in the day, with Lou shooting a deer and then going to the bank to empty her account. Lou knows that she missed her deer shot by 4 inches. She has arthritis in her wrists. A big storm is headed into town and the residents are battering down the hatches to secure their homes. A hidden person is stalking Lou. A mother, Hannah (Jurnee Smollett), playing hide-and-seek with her young daughter, Vee (Ridley Bateman), outside their home. Lou (Allison Janney), the landlady and loner living with her dog Jax, stops by to say the rent is due the next day. Hannah wants an extension as she had to buy supplies for the storm, but Lou refuses. She is a person of few words and hard. Lou almost hits Vee on her way out and tells Hannah to teach Vee to look out for herself. Hannah is livid at Lou for driving fast. While in the village buying some supplies, Lou talks to the sheriff Rankin (Matt Craven) about her arthritis. He tells her a copper bracelet could help her condition.Expecting a large storm, Chris (Greyston Holt), Hannah's male friend, offers to bring supplies. He picks up a hitchhiker who kills him in his van. The hitchhiker cuts power to Hannah's home, and, while she is outside trying to restore power, he kidnaps Vee and flees with her on foot. Hannah, meanwhile, finds Chris's van and finds him dead inside. She rushes back home to find Vee missing. On her bed is a photo of a young Vee with a man. Hannah runs to Lou's house, interrupts her suicide attempt (after Lou left Hannah her house and all her belongings, indicating that she loved Hannah and Vee from her heart) (Lou was committing suicide based on certain recent news events, which indicates that Lou had something to do with them. and she felt that her actions left the world a more dangerous place), and tells her Vee is missing. Hannah suspects that Vee's father Philip has kidnapped her. Lou's truck blows up due to a bomb set by the hitchhiker. Hannah and Lou set off tracking him and Vee into the night during the storm. Lou knows Philip will try to take Vee off the island, but airports and ferries are closed due to the storm. He must be headed to the coast, to catch his private vehicle.Hannah informs Lou that the hitchhiker is Vee's father, Philip (Logan Marshall-Green), a special forces soldier and criminal she thought was dead. Lou finds and kills Philip's friends Tony (Daniel Bernhardt) & Gerry (RJ Fetherstonhaugh) on the way, clearly showing she is more than she appears to be. She explains to Hannah she is an ex-CIA field agent of 26 years. Before dying Tony tells Lou that Philip is headed to Eagle Bay. Hannah uses Tony's radio to contact the sheriff, and this tips off Philip. Lou and Hannah track Philip and Vee to the beach at Eagle Bay. Philiphad been leaving clues for Lou all over the trail, which she hides from Hannah. Lou sends Hannah to radio for help, while she goes to confront Philip and rescue Vee. After a standoff, it is revealed Philip is actually Lou's son, who tracked them down after she turned him in and hid them for protection. It is also revealed that Lou abandoned Philip to not blow her undercover mission. Philip feels Lou chose the over CIA over him. Lou reveals that she thought that Philip was dead (as revealed by Hannah earlier that Philip died in an explosion in his own house). She says she only protected Hannah and Vee and thought her mission was complete. Philip injures Lou and leaves with Vee, intending to kill all of them together.Hannah contacts the sheriff, but a call from the marshal's service forces him to stand down, as it's a federal case now. Meanwhile Hannah finds Lou, who tells her the story between her and Philip. Lou says that after she heard Philip died, she got her friend to run into Hannah and persuade her to move to Orcas Island. Lou knew that one day they will need protection. Hannah is angry and leaves Lou to go after Philip at the Lighthouse. The sheriff goes to Eagle Bay nonetheless, where he finds Lou and gives her a copper bracelet for her wrist. Lou tells sheriff that CIA is looking for her she kept evidence of their wrongdoing in Iran. Meanwhile, Hannah arrives at the lighthouse and manages to get Vee away from Philip. After a scuffle, Hannah injures Philip and flees with Vee. Lou finds the lighthouse filled with explosives and sets them off from a distance, destroying it to signal an approaching CIA helicopter. Lou tells Hannah to head towards town with Vee, as she holds up Philip. Lou and Philip fight on the beach, until she gains the upper hand and hugs him. She apologizes as a CIA agent fires on them, and both Lou and Philip go under the water's surface.Later, Hannah and Vee are shown in Lou's house, packed up and ready to leave. After a few questions from CIA agents and a goodbye from the sheriff, they are seen on-board a ferry with Jax, who looks at someone on the upper deck, not fully in frame. The camera shifts to show a woman's arm with a similar scar that Lou had and a copper bracelet, as she watches the three through binoculars.