Report Number 1527 is a cut content book in The Witcher 3: Wild Hunt, still present in the game files, but only obtainable through console commands.

Journal entry

Report no. 1527
Agent DQ4

Who is Who in the Novigrad Underworld
Order reigns in the city's criminal underworld and has for some time. One suspects no unauthorized thievery, banditry or hucksterism of any sort takes place here. Perhaps this is a testament to the City Council's effective reinvigoration of the Temple Guard, but it is my opinion that the true cause lies in the rise of organized crime groups. Our agents' mission is to identify their leader (or leaders) and bring about their collapse from the inside.
Tasks:
Investigate gambling dens.
Inspect houses of ill repute.
Inflitrate shopkeepers' circles and determine if they are paying protection or tribute.
Interrogate apprehended criminals and determine in whose employ they remain.
Additional remarks:
Agent "Gisel" has observed certain individuals convening for mysterious meetings at the city bathhouse from time to time. The building is closed to the citizenry of Novigrad during said assemblies.