When a high school student starts dating a rebellious boy from a different school, she quickly finds herself in the crosshairs of someone trying to break them up - or hide a dangerous secret.

Hannah is thrilled with how her senior year in high school is going. Her best friends always by her side, her mom is so very supportive, and she just got a coveted scholarship to Stanford University. However, Hannah joins an online chatroom where she meets a guy she falls for quickly, and things quickly go from very good to awful.

A brokenhearted New York painter, Ava, and a West Coast widower, Mason, have their lives collide when Mason’s young daughter, Mia, rents out his guest house to Ava for Christmas, without her dad's knowledge, in an attempt to convince her dad she is responsible enough to earn a dog for Christmas.

Fearing her boyfriend is cheating on her, Nicole tests him with a fake social media profile she's made under the name "Heather Harris." But when a girl named Heather Harris enrolls at her school, Nicole suspects something sinister.