Benardete, Seth, Socrates' Second Sailing: On Plato's Republic, Chicago: University of Chicago Press, 1989.

Excerpt:

The title of this book alludes to the phrase Plato has Socrates use in his intellectual autobiography in the Phaedo. Socrates tells his story as a preface to his reply to Cebes’ counterargument to the proof Socrates has given about the deathlessness of soul. Cebes grants that if the soul never took on body, it might never wear out, but he wonders how continual reincarnations of soul could be shown to have no end.

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