Critical Dialogues in Cultural Studies by Stuart Hall (the academic, not the sex offender) - was taught by him at OU Summer School
a Ruth Rendell
a few Colin Dexters
couple of Andy McNabs
Captain Corelli's Mandolin
Writing Home by Alan Bennett
a few Graham Joyce novels
3 Para by Patrick Bishop...
John Harvey's Resnick novels, Peter Robinson's DCI Banks, the original Morse novels, anything by Ruth Rendell, Val McDermid's Tony Hill/Carol Jordan books, historical mysteries by Paul Doherty or Susanna Gregory. But especially John Harvey.