The Chestnut Man(2021)

Set in Copenhagen in October, The Chestnut Man builds its mystery around a ritualistic killer signature: a small figure made of chestnuts left at each crime scene, each one carrying a piece of evidence that shouldn't exist. The procedural pacing is deliberate, with detectives Thulin and Hess working through physical clues rather than confrontations, and the dread accumulates quietly across episodes as the pattern becomes harder to explain away.

A cold case runs underneath the active investigation the whole time, and the two threads pull tighter with each discovery. Rosa Hartung, a politician whose daughter vanished a year earlier and was presumed dead, keeps being drawn back into the inquiry as the evidence points somewhere it logically cannot. Her grief is specific and present rather than decorative, and the show treats the intersection of her private loss with a very public murder investigation as the knot the story is actually trying to untangle.