Shrewsbury is the location of a much-loved series of murder-mystery "detective before detectives were invented" novels -- the Brother Cadfael books by Ellis Peters: the sleuth here, being a 12th-century Benedictine monk at Shrewsbury Abbey. Many other writers have embarked on this particular "bandwagon": including the extremely prolific Edward Marston, who has written and had published, literally scores of murder-mystery novels set in an assortment of different eras (including a series involving 19th-century British railways). One of Marston's series, is a "medieval 'tec" one, where the investigators are a team of compilers of William the Conqueror's Domesday Book -- who somehow keep encountering puzzling murders wherever they go in England. One novel of this series, is set in Gloucester. (My personal opinion of this series of Marston's, is not very high -- competently-enough done, but rather dully plodding: I find Ellis Peters's style much superior.)