When high school student Clay Jenkins receives a box in the mail containing thirteen cassette tapes recorded by his classmate Hannah, who committed suicide, he spends a bewildering and heartbreaking night crisscrossing their town, listening to Hannah's voice recounting the events leading up to her death.

Sixteen-year-old Steph Landry finds an old book on how to be popular and decides to change her social status by following its advice, much to the bafflement of her two best friends.

The Garde, broken and divided, discover that the Mogadorians have commenced their ultimate invasion plans and will stop at nothing to thwart it.

In rural Ohio, friendships and a beautiful girl prove distracting to a fifteen-year-old who has hidden on Earth for ten years waiting to develop the Legacies, or powers, he will need to rejoin the other six surviving Garde members and fight the Mogadorians who destroyed their planet, Lorien. Friendships and a beautiful girl are distracting to a teenager who is hiding on Earth while he waits to develop the powers he will need to rejoin the other six...

In a small South Carolina town, where it seems little has changed since the Civil War, sixteen-year-old Ethan is powerfully drawn to Lena, a new classmate with whom he shares a psychic connection and whose family hides a dark secret that may be revealed on her sixteenth birthday.

As the first anniversary of her best friend Kim's death nears, fourteen-year-old Emmy tries to fulfill her promise to make contact with Kim's spirit, but she gains new perspective from unexpected connections.