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Jussi Adler-Olsen: The Keeper of Lost Causes [aka Mercy] (Department Q) (2011, Dutton)

Carl Mørck used to be one of Copenhagen’s best homicide detectives. Then a hail of …

Also known as "Mercy"...

Starts very slowly and gets better over time. Was loosely used for the script of the "Dept Q" TV series and transposed to Scotland. The main story line is there, but there are so many differences, almost 2 different stories.