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The four 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.' These are quite separate stories, and can be read as stand-alone books. However, you will enjoy the third in the series, 'To Love and To Protect,' more if you have read at least one of the others. The fourth in the series is a little different, and covers Shuki's mature years, and even ranges forward a few decades. This can be read as a stand-alone book. There is no 'adult' material in this one, though there is in the earlier novels, especially the first.
The four Penwinnard Stories are about the boys of Penwinnard Boys' Home - their spirit, their occasional mischief, and their aspirations. I expect that there will eventually be six stories, with Bob's future resolved in Number 6.
These books are also available as paperbacks.