Nira and her friends Emi, Sam, Aiden and Chris have been making the best of life under quarantine but boredom leads to paranoia when Nira thinks she heard a scream from her next door neighbor. The group tries to piece together what happened but only one person can help, the guy Emi has a crush on and whom Nira hasn’t spoken to in years: Luke.
When Luke sends a video that confirms Nira's suspicions, the group decides they need to gather more evidence. Nira volunteers to go on a walk-by and gets closer to her neighbor’s house than she probably should.
After Nira’s walk-by brings new evidence, the group decides to do a virtual sleepover / stake out of the neighbor's backyard while Emi tries to distract herself after a racist encounter. When the suspect shows up in the backyard, the group realizes this is more real than they thought.
With Nira's phone and Aiden's remote control car missing, Aiden starts receiving messages from someone claiming to have them. The group works together to get their stuff back and put a face to the mysterious person sending the messages.
After the drop at the park takes a turn, the group starts to come apart. Everyone decides to take a break but Nira persists in scanning the clues, which leads to some surprising revelations — both about the mystery and her relationships.
After connecting the shoes seen in the car footage to one of their friends, the group must decide whether or not to confront them. In the meantime, Sam deals with a family matter as Nira realizes she needs to see what's buried in the neighbor's backyard, once and for all.
After Nira sees the footage from her old cell phone, she starts to investigate other possible suspects. Meanwhile, Chris and Aiden work together to crack the emoji code while Luke pulls away from the group.
With accusations flying, the friend group implodes leaving everyone to decide whose side they're on.
When the group sets a trap for the suspect, emotions run high and the truth comes out in surprising ways.
When the suspect gets too close to Nira, the friend group sets out to figure out who is behind the mystery, once and for all.
When Chris' family's restaurant is tagged after Sam's Black Lives Matter march, a mysterious question mark-faced figure takes the credit and threatens more. The search to unmask their identity leads the group to one of their own.
After an unlikely confession, Nira vows to find the truth. But the group’s hunt for clues only makes the suspect look guiltier, until Chris finds new evidence.
When another Question Mark Face video eliminates their top suspect, the friends are shocked when it appears the person behind the mask is closer than they think.
After making contact with Question Mark Face, the friends set up a sting to catch them. What they don’t realize is that their target is already one step ahead.
As the team races against a ticking clock to uncover Question Mark Face's true identity, Emi begins to suspect Sam's secret crush, setting their relationship ablaze.
With one final clue, the group unmasks Question Mark Face. But when they discover their motive, the friends realize the problem is deeper than they thought, and it's up to them to make things right.
