By Richard Shears. If you're wondering how many cases like this there could be, it's the same one -- Lindy Chamberlain (the "major motion picture starring Meryl Streep" is noted on the back). This 1988 paperback is the U.S./St. Martin's version of a 1982 Australian book called, with almost admirable bluntness, The Dingo Baby Case.
If you're not utterly turned off by the marketing of this story, consider picking up this PB: there's noticeable edgewear, and the spine has cracks and a slight lean to it; you'll also note some page toning/foxing and a stamp inside. But it's a seldom-seen book on a case that, alas, became something of a punchline in the '80s; give it a look.