SASHA and TOMMY are climbing the Leaning Tower in Yosemite Valley. As they climb, a slab of ice breaks off the summit and rains down upon them. One hits Tommy and he falls, but because they are connected by their safety, he is yanking Sasha down too. Tommy disconnects himself and falls to his death.

One year later, Sasha is not dealing with her grief well. She lives in a sprinter van and while driving is pulled over by BEN TREVINO. It is revealed she is going to do a river course on a canoe in honor of her husband.

Sasha starts her course and sets up a campsite for the night. While she is sleeping, she hears a mechanical grinding and sees something move in the trees.

The next morning Sasha sets out on her course and finds her canoe is sinking because there are holes in it. She pulls to the shore and makes sealant.

As she moves down the river, she feels sick and pulls to the shore and vomits. Someone spiked her water. She spends the rest of the night onshore.

Sasha is moving down the river the next morning when she is caught in a...