Movie starts with bro and sis at a diner. They have hunting rifles and bags of money, so you find out they robbed something maybe a bank. The brother talks to his sister about his niece and says, "Shes what 10 now?". The sister tells him shes 6. They go to a house on a farm to hide out until the heat dies down for two weeks.
The brother has a book with instructions on how to use the house to time travel or go to a dimension that is out of the space time continuum. You get the regular time travel fare where they think this is fun and goof around a bit. They talk about how the brother feels guilty about leaving the sister behind during a previous job(?they don't specify what really happened). The sister says getting caught helped her turn her life around, and afterwards she had her daughter. The sister runs a failing antique shop, and the brother runs a failing bar. You find out the brother was told about the house and given the book by a patron.
When two weeks are up the brother and sister try to leave, but the door to the attic that lets them time travel is boarded up. At the mill you find a burnt up body with a watch. The brother says its the bar patron that gave him the book and he knows because she was wearing a watch that was her family's heirloom. They find out that the house is ran by the vice on the left and the vice on the right. The vice controls time, left is the past and right is the future. They use a tape recorder to talk to the vice MULTIPLE TIMES THROUGHOUT THE MOVIE. The vice says they shouldn't be there and will be wiped from existence, unless they can kill an intruder that the vice can't detect.
The brother and sister wait for the intruder for a year plus. Over the time you get regular "Ground Hog Day" sad time travel fare while they wait. They argue and talk about how shytty one of their parents were to each other. The intruder shows up and they get into a gun fight. The whole time they use the pronouns they/them/it for the intruder. The intruder takes the brother hostage. The sister gets into a melee fight with the intruder. The sister takes off the mask and recognizes them as her daughter but in her 20s. The daughter is also the bar patron that gave the brother the book, and told him about the house.
The intruder puts the mask on and the sister stops fighting. The brother comes in and tries to shoot the intruder, but the sister jumps in front and takes the bullet. This sister dies from the gunshot wound trying to tell her brother. She doesn't get a chance to tell the brother its her daughter because she's busy choking on blood. The brother asks the intruder why they're doing this and she says, "To save her family". I might have this mixed up a bit but its the basics of what happens here.
The brother goes back into the attic and meets the vice in person. They tell him he failed, and they will wipe him from existence. He convinces them to send him back to a time right before he goes to the diner.
The brother comes back to right before the movie starts. The movie cuts to away before the sister comes in. The sister asks a gentleman where did he get those bags from. The gentleman says, "I killed the man that had them. I've seen you die over and over. Kill me so that doesn't happen anymore." The camera slowly reveals that, the gentleman is the brother but this time he's 60
SICK!
I knew the intruder was a woman because they kept using gender neutral pronouns too often. Watching all those giallo movies gave me practice of telling the gender of masked individuals. The intruder kinda looks like a giallo killer. I knew it was the daughter cause it made the most sense. I also knew the guy at the diner was the old version of the brother before they panned to his hand.
Basically the bro sacrifices himself so that his sister and their daughter can have a better life than he and his sister dead. This ends the generational trauma that plagues the family.
IDK how the chain of events with the daughter going to her uncle when she's in her 20s or 30s, and tells him about the house. I think the bro and sis do the job because they know about the house. Also how could the daughter's burnt up body be in the mill. How does this save her family? At the end it implies the sister is going to prison for killing her old brother. Maybe she weasels her way out of doing time, and says that guy killed her present version of her brother. Was the first interaction we see further in the loop or was he just a bad uncle and didn't know how old his niece was?