Three years ago, Elsa’s astronaut brother Franck vanished into outer space. Frozen by grief, 23-year-old Elsa spends her days obsessing over Franck’s mysterious disappearance, retreating into an imaginary world where her brother is still with her. Just when all hopes of ever recovering Franck seem lost, Elsa suddenly receives a transmission that only she can hear, from an extraterrestrial entity who offers to bring Franck back—for a price.