An author, preparing a book about a well-publicized murder case in a small California city, is killed when his yacht blows up. The author's publisher hires Mannix to find the book's last chapter, which is said to solve the murder case. Mannix encounters a hostile police chief who wants to chase him off and an oil-company executive wanting to buy him off. Mannix refuses the bribe and endures a beating but remains committed to finding the missing chapter. Written by
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After Celia Bell (Barbara Rush) gives Mannix what is supposed to be the missing last chapter of the book Mannix is searching for, he compares a page from that chapter with a page from an earlier chapter in her motel room. These pages are typed with a serifed font (common on manual typewriters of the era) similar to Courier or Prestige Elite. When Mannix takes them to newspaperman Archer (Kevin Hagen) to examine them with an overhead projector, however, the pages - although the content is similar - are now typed in a non-serifed font similar to Helvetica or Arial. (Furthermore, although non-serifed fonts would have been available on early versions of the IBM Selectric during that era, they would not have been found on a manual typewriter without interchangeable typeface elements.) See more