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      Brian O'Sullivan Books in Order

      Thriller · 24 books
      Latest Release Fionn: The Betrayal April 2025 · Jump to book
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      Brian O'Sullivan Books FAQ

      How many books has Brian O'Sullivan written?

      Brian O'Sullivan has written 24 books.

      What is the latest Brian O'Sullivan book?

      The most recent release by Brian O'Sullivan is Fionn: The Betrayal, published in April 2025.

      What genres does Brian O'Sullivan write?

      Brian O'Sullivan writes primarily Thriller.

      What series has Brian O'Sullivan written?

      Brian O'Sullivan does not have any listed series and is best known on FictionDB for standalone books.