Death on Highway 13

A dead body is dumped early one morning on Highway 13 by two men. The deceased, Dave Lomas, was murdered by members of a motorcycle gang, The Skulls of Highway 13. He messed around with them one too many times. Private Investigator Gary Bennet, who specializes in spying on cheating husbands, takes on the case to prove to himself and others that he is able to solve an important assignment for once in his  fledgling career.
Bennet finds out too late that the case he is hell bent on solving might end up getting him killed instead. But the more dangerous the case becomes, the more he stubbornly purses it, ignoring the price he'll be forced to pay.