There's a Hippie on the Highway by James Hadley Chase (Author)

It seemed like a good idea at the time to ex-paratrooper sergeant Harry Mitchell, home after three years in the deadly jungles of Vietnam. Head south to Florida, get a summer job, soak up some sun, relax a bit. But when he got to Paradise City he found himself drawn into a lethal set-up where dumped corpses, smuggling operations, over-ambitious cops, hired killers and a sexy little double-crosser called Nina combined to make life very unhealthy. It was just as well for Harry Mitchell that he’d learned to look after himself in Vietnam...