Terry Pratchett’s The Fifth Elephant. (Full Audiobook) 

The Ankh-Morpork City Watch is expanding; there is now a Traffic department with traffic cameras implemented using iconograph technomancy and a wheel clamping team, and the clacks is beginning to replace homing pigeons for communications between officers. The Watch is also investigating the theft of the replica Scone of Stone (a parody of the real-life Stone of Scone) from the Ankh-Morpork Dwarf Bread Museum and the murder of Wallace Sonky, the inventor of preventatives.