Cambridgeshire is a notorious murder hotspot with determined detectives around every corner, if the huge number of crime novels set here are to be believed. From the sleuthing vicar of Grantchester in the Sidney Chambers novels by James Runcie, to Alison Bruce’s DC Gary Goodhew of Parkside police station in central Cambridge and even medieval teacher Matthew Bartholomew investigating murky goings-on at the university in Susanna Gregory’s series, there isn’t an innocent spot in the city. There’s something about Cambridge that inspires a fictional detective to set about solving a mystery and fro…