Mike dives to see how a woman escapes from a locked truck at the bottom of a lake. Watching a near-tragedy underwater, he takes his concerns to Harry Baldwin, the head of the carnival show. The girl's life is placed in serious danger when Harry sabotages the trick in revenge for her falling in love with another man.moreless
While working on a project to formulate a safety code for skin divers, Mike meets up with an old flame who has her own safety issues while skin diving. She is trying to combine skin diving with her job as a photographer, but needs a portfolio and wants Mike's help in shooting a sunken barge off the coast of Mexico. Her impatience brings both Mike and her to the brink of death.moreless
A ranger calls the Highway Patrol when he sees a small plane coming down in what he thinks is an emergency landing. Mathews arrives to find the empty plane intact and the ranger murdered.moreless
While inspecting some of the outlying Highway Patrol substations, Dan decides that breakfast sounds good and stops at a dinner in a small town, only to be told that the stove has just broken. He tries another place that closes as soon as he gets there. The town's general store is closed and Dan's suspicions rise when he sees no one anywhere in the town.moreless
A guard is killed during a prison break and the escapee is a ruthless career criminal who will stop at nothing to prevent capture by Chief Dan Mathews and the Highway Patrol.