When rehabbing a downtown apartment building, some Copenhagen construction workers uncover a hidden room containing the mummified remains of three people sitting around a dinner table with an empty fourth chair. The discovery marks another mystery to be solved by Department Q, the surprisingly effective cold-case unit run by stubborn, traumatized Detective Carl Mørck (Nikolaj Lie Kaas) and his personable assistants Assad (Fares Fares) and Rose. Palm Springs audiences loved the first in the series of Danish crime writer Jussi Adler-Olsen's work adapted to film (The Keeper of Lost Causes, PSIFF 2014). The Purity of Vengeance is the fourth entry, also a standalone, and like the others, it journeys deep into the undercurrents of abuse and malice lurking beneath the polished surface of Scandinavia. Here the mystery harks back to a reform school for girls on a remote island, where the young inhabitants were sterilized without their consent.