Destination Unknown is a tense and at times heart-wrenching psychological piece in the vein of the classic stalker thriller. The author's style is bold, the characters well developed, and the pace nearly perfect. Although formulaic, Zelazny knows his genre and takes great efforts to turn common cliches on their heads. While I did not personally like the stylistic choice to fall into present tense in some internal dialog, it is clearly a stylistic choice and the story's prose is otherwise superb.