Jake Of All Trades - These Mean Streets, #1

A former Hell's Angel gets out of jail and returns to the mean streets of Glasgow. But society does not forgive an ex-con with a record of violence. He can only find temporary work that pays minimum wage. He decides to set up shop as a private investigator, downloading a fake licence to add authenticity. In his first big case he is hired by an ex-teacher to find her missing granddaughter. She offers free advertisement instead of cash.
He soon attracts the attention of  gangsters who threaten to kill him unless he gives up the case. But he has discovered the girl is to feature in a snuff film. It leaves him with an ultimatum-fight and risk prison, or flee and forget about the girl.