Katherine Crawford

Agent Sam Casey is in a satellite explosion and the radiation turns him invisible. He gets a watch that keeps him visible, and he uses it to switch from visible to invisible. He is assigned to transport a chemical called Tripolydine, which is purported to be the most efficient fuel; when the cover is blown on that and he uncovers and stops the Tripolydine fraud, he must then stop a terrorist from blowing up race cars.

A bomb on board an airliner has an altitude-sensitive trigger. Unless a ransom is paid, it will explode when the plane descends to land.

A sophisticated, middle-aged grandmother, wed to a New York law professor, falls in love with a down-to-earth Tennessee farmer.

Two pilots are hired to reclaim a stolen jet from the son of a South American dictator.