Larry Kent: The Big Contract (Book #702‪)‬

Larry Kent was on his way back to New York, fresh from a fishing vacation in the Gulf. When he stopped off in the city of Faro his plan was to get a drink and something to eat and then move on. But the bartender at the Green Light made the mistake of serving him a Mickey Finn and then robbing him.
Larry woke up in a deserted alleyway with a pounding headache … and inadvertently became the star witness in the cold-blooded murder of a prominent businessman.
He quickly discovered that Faro was hock-deep in corruption. The Mafia was planning to move in and take over completely. Only Larry stood between the mob and their latest conquest. So he became a marked man … and every hitman around intended to collect on that Big Contract.