When 10-year-old Lukas disappears, investigator Erik Schäfer has little to work with. Until he discovers that the boy is obsessed with pareidolia – the psychological phenomenon where we see faces in random things – and has recently photographed an old barn door. Journalist Heloise Kaldan thinks she recognizes the barn – but from where?

Kaldan drops her current article, a controversial investigation into soldiers with PTSD, to cover the story of the missing boy. But when she realises that the traumatized soldiers are mixed up in Lukas' case, Schäfer and Heloise must try to separate optical illusion from reality – before it's too late.