Who Was Callie?

In the early 70s, a small industry grew up trying to find the answer. Toylors at this trade looked for a monster, but all they found was a non-entity. A bland young man burdened it seemed with as much ordinariness as any single individual could bear and almost too much of a conventional and commonplace to retain what is necessary for human identity. So back to the book, Who Was Callie?