A father survives a plane crash in rural Appalachia, but becomes suspicious of the elderly couple who take him in to nurse him back to health with the ancient remedies.
When Detective Kat Donovan matches on a dating app with the fiancé who disappeared years before, she learns that some secrets are best left in the past.
The murder of a female GP in a rural playground in front of numerous witnesses draws a group of detectives into an ever-darkening mystery that takes them across Europe, aided by mysterious notes sent by the "Ghost Detective".
