By George Sullivan. Scholastic's take on Etan Patz, RFK, the Zodiac, and more from 1992. (There's also a sequel.)
This paperback looks a bit older than it is thanks to page toning; the top front corner of the cover is clipped, and a previous owner's name is on the inside. Great for Scholastic collectors, or for throwing in your bag to read in line at the p.o.