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The three books of the Shuki series are available as ebooks and as paperbacks. 'Not a Man' is the first of the Shuki Series, followed by 'The King's Favourite' and then 'To Love and To Protect.' You do not need to have read 'Not a Man' in order to enjoy the others of the series. They are quite separate stories, though still about Shuki, the one who began as a slum boy, and ended as a person to be very much respected, even though not a man.
The three Penwinnard Stories, 'Angel No More,' 'You Gotta Have Manners' and 'Trevanian's Leap' are about the boys of Penwinnard Boys' Home. These are available here and on other sites. They are also available as paperbacks.