Teddy Angstrom is no stranger to morbid public interest in her family’s tragedies. And when her father dies suddenly, ten years to the day after her sister Angie’s disappearance, she intends to maintain as much privacy as she always has. Clearing out her father’s office, however, Teddy discovers her father’s double life: a decade-long investigation into wild conspiracies from a Reddit community of true crime fans fixated on Angie. Repelled and compelled in equal measure by this new online dimension, Teddy finds herself falling down that same rabbit hole. So when nineteen-year-old Mickey, a charming amateur internet sleuth, materialises in real life, Teddy determines that the two of them are going to team up to find out what really happened to Angie – and whether there’s any chance she might still be alive.