Series
The Secret Kingdom series has 14 books.
Published between 2011 and 2025. The publication order differs from the reading order — both are below.
Three friends discover a magical valley where unicorns roam and enchantment sparkles in every breeze. But a shadow threatens the valley's peace, and the girls must help the unicorns before the magic fades forever.
The Books Oracle — track the series you are partway through, and see what to read next.