they started at the beginning of the trail , at the marina in great yarmouth , and at first the owner was a bit reluctant to answer any questions , but after detective sargent smythers produced his warrant card and explained that they were on the cold case section at the local nick he became more helpful , and to help smooth the way they then ripped that other detective to bits for a few minutes it was a man thing , she had been a right snotty cow , the owner said .