[The bizarre story of The Young Unicorns] turns on a power-mad brain surgeon's discovery of the stunning potential in a micro-laser to control men's minds. What's most fun here is the author's outrageous imagination coupled with her ability to characterize so many people adequately; the sheer number, however, will occasionally leave readers bewildered. Dave, a troubled youth, begins and ends the book, but in between the action sways away from him, and nearly all the characters receive equal time. Surprisingly, the supernumeraries and suspense-gorged plot are so integrated as to add up to a carnival show for young readers in a giddy, mind-stretching book. (pp. 149-50)

Jean C. Thomson, in School Library Journal (reprinted from the March, 1968 issue of School Library Journal, published by R. R. Bowker Co. A Xerox Corporation; copyright © 1968), March, 1968.