Wikipedia
Trebizon is a series of school story novels by Anne Digby set in the fictional school of that name. The fourteen novels were published between 1978 and 1994. Like Enid Blyton's much earlier creation, Malory Towers, Trebizon is located in Cornwall.
The novels follow the protagonist Rebecca Mason from when she joins the school in the second form through to the end of her fifth year. A major theme throughout the series is Rebecca's burgeoning talent for tennis. Other major characters include Rebecca's two best friends, Tish Anderson and Susan Murdoch, and her boyfriend Robbie Anderson.
Despite their more recent publication dates, the later books in the series are substantially harder to obtain than the earlier ones. This may be because fewer copies were printed during the 1990s recession in the UK book trade. The series is currently out of print but retains a dedicated fan base and titles frequently change hands in a thriving second hand market.
All fourteen books are currently available on Amazon Kindle. The series is about to be reprinted by Egmont, with illustrations from Lucy Truman. The first three books are being released on 28 January 2016.