Miriam and her husband Caleb drive towards her sister Greta's cabin, where the two act uneasy with each other. At the cabin, the two spend time with Greta and her husband Dylan. Later, Dylan and Miriam hike through the forest until the two set up camp for the night.In the present, Greta and Miriam act distant towards each other. As Greta is stressed by not preparing for Dylan's family gathering, Miriam offers to help make ice cream for her sister. With Greta outside preparing tables, Miriam pulls out a jar of an unknown substance from her bag to add to the mix.In another moment in the past, Miriam meets Dylan at the cabin under the pretense of sleeping with her. Convincing Dylan to strip naked and being blindfolded, Miriam asks Dylan about what it felt like when he assaulted her before knocking him unconscious.As Dylan and Miriam set up camp, the two talk about Miriam's dreams before she kisses Dylan. The next morning, Dylan assaults Miriam while she remains asleep, waking up and begging him to stop. Miriam walks back to the cabin on her own.After knocking Dylan unconscious, Miriam bounds Dylan to a chair as she prepares to kill him. After hearing a boat passing by, Miriam duct-tapes the blindfold before wrapping a plastic bag around Dylan's head. Dylan begins to suffocate, forcing Miriam to tear the bag open as Dylan headbutts her. He breaks free from his restraints as Miriam struggles against him, leading her to choke Dylan. Miriam cries at killing Dylan before burning the body.In the past, Miriam returns, climbing into bed with Caleb. Attempting to sleep with Caleb, he rebuffs her as he walks out of the room. Seeing the three on the docks, Miriam attempts to free a rabbit before encountering Dylan. Miriam confronts Dylan only for him to deny all responsibility, reasoning that she wanted to be assaulted.After choking Dylan, Miriam hangs Dylan's body upside-down as his blood drips into a cooler below. She fills containers with Dylan's blood and dismembers Dylan's corpse, scrubbing all traces of evidence from the cabin. Miriam puts on a wig before arriving at a motel, encountering a couple arguing outside. In the motel bathroom, Miriam pours the blood down the bathtub drain while flushing blood-soaked rags in the toilet.As Miriam and Greta swim in the lake, Miriam informs Greta of Dylan assaulting her. Greta refuses to believe Miriam, causing Miriam to swim back to shore in anger. Miriam later argues with Greta skinning a rabbit, causing Caleb to leave out of embarrassment. The scene shifts back to Miriam grinding Dylan's bones to dust, placing them into the jar shown earlier.In the present, Miriam and Greta discuss Miriam's dream, to which Greta tells Miriam that she still loves her. At the family gathering, Miriam looks at everyone, unaware of Dylan's fate. (thanks to Wikipedia)