The prologue of Until Dawn introduces us to 8 main characters: Josh, Hannah, Beth, Mike, Emily, Matt, Jessica, and Ashley.
Josh is a wealthy young man whose parents perished in a horrible accident a year earlier. He decides to invite his friends to their family's old mountain retreat in an effort to cope and finally find closure.
Hannah and Beth are twins - Hannah is the wilder and more impulsive sister, while Beth is quiet and more serious.
Mike and Emily become fast friends while they're discussing their bad experiences at the retreat, as do Matt and Jessica. Emily and Matt are a couple, and Jessica is interested in Mike.
Ashley is the group's outsider; she used to date Mike before he and Emily got together.
Tensions flare as the night progresses, and the group discovers that something terrible lurks in the shadows. Together, this group of 8 friends must race against time to survive the night and make it out alive.