Sixteen-year-old Mehreen is overwhelmed by her anxiety and depression, and she doesn't believe anyone in her life will understand if she tries to talk about it. She's been thinking about suicide for a while when she discovers a website called MementoMori.com. The site matches people with partners and assigns them a date on which to end their lives, together. Mehreen is partnered with Cara and Olivia, strangers dealing with their own struggles.