Jack Holborn [is] a taut, tough and exciting story, complicated but so well-told that it held me to the last page. The old cliches [about pirate tales] are given fresh turns, and the spectacular additions to the formula include a desperate trek through an African wilderness, a tense slave-market auction and a London trial in which the prisoner claims a place on the judge's bench….

[Jack Holborn] plays a more effective part in the story than most young pirate victims, and the ups and downs of his fortunes provide as good an incursion into the world of derring-do as any older boy would wish while many a younger one … will find this his dish. (p. 42)

Margaret Sherwood Libby, in Book Week—The Sunday Herald Tribune (© I.H.T. Corporation; reprinted by permission), October 31, 1965.