Twice Shy is a thrilling mystery novel, first published in 1981, following Jonathan Derry, a physics teacher who accidentally acquires a computerized horse-betting system hidden within cassette tapes. As he realizes its potential, he becomes the target of ruthless enemies determined to reclaim it. The novel unfolds in two parts, with William Derry, Jonathan’s younger brother, stepping into the danger years later, leading to a suspenseful and high-stakes struggle.