Set in the Aokigahara Forest, a real-life place in Japan where people go to end their lives. Against this backdrop, a young American woman comes in search of her twin sister, who has mysteriously disappeared.
Soon after the break of the pandemic and realizing that his clock is ticking, Kristofer gets the urge to embark on a journey to try to find out what really happened when his Japanese girlfriend mysteriously vanished without a trace from London fifty years earlier.
The early days of a young Endeavour Morse, whose experiences as a detective constable with the Oxford City Police will ultimately shape his future.