Scandi crime drama has been a thing for a while, but the television series Lyckoviken (created by Camilla Läckberg) is like a soap opera crossed with a crime drama.
The crime took place in 2000 so according to the series, Filofaxes were popular then, so they looked for clues in the coded entries.
That’s Ia Langhammer! She’s in Det som göms i snö, which was wonderful. I am eagerly awaiting the second season.