Department Q

The same first novel is called Mercy in Britain and The Keeper of Lost Causes in America, and people buy it twice.

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Where to start with Department Q

Read the books in publication order. There are strong continuing arcs running underneath the cases, so this is not a series to dip into. On screen you have a choice between the faithful Danish films and the better known Netflix version, and they are separate tracks rather than one timeline.

  1. 1
    Book one, under whichever title your shop sells it Mercy

    Mercy in the United Kingdom and The Keeper of Lost Causes in the United States are the same novel. Buying both by mistake is the single most common error with this series, and it affects the first five books.

  2. 2
    The 2013 Danish film, if you want the faithful version The Keeper of Lost Causes

    Direct, in order adaptations set in Denmark with the characters' own names. Film one is book one, and that holds all the way through to film six.

  3. 3
    Dept. Q, if you want the version everyone is talking about Dept. Q

    Nine episodes, self contained, no prior knowledge needed. It relocates the whole thing from Copenhagen to Edinburgh and renames most of the cast, and it is the entry point most new audiences arrive through.

Then what? The Danish films come in two blocks with a visible seam. Films one to four are one cast, films five and six are another, so watch them as two runs and expect the leads to change faces. Do not start with The Marco Effect or Boundless, which assume the earlier films, or with book six or seven, which lean heavily on earlier arcs. A reasonable pairing if you want both is to read book one, then watch film one, and so on.

A suggested way in, not an official one. The full list is below: tick anything off in either place.

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The novels

  • Mercy 2007
  • Disgrace 2008
  • Redemption 2009
  • Guilt 2010
  • Buried 2012
  • The Hanging Girl 2014
  • The Scarred Woman 2016
  • Victim 2117 2019
  • The Shadow Murders 2021
  • Locked In 2023
  • No Song for the Dead 2026

The Danish films

  • The Keeper of Lost Causes 2013
  • The Absent One 2014
  • A Conspiracy of Faith 2016
  • The Purity of Vengeance 2018
  • The Marco Effect 2021
  • Boundless 2024

The Netflix series

  • Dept. Q 2025, 2 seasons, 9 episodes

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