The 39 Clues (Linda Sue Park) Books in Order

The original 39 Clues arc is a multi-author adventure built around siblings Amy and Dan Cahill, who learn at their grandmother Grace's funeral that their family is tied to a secret power hidden across history. Instead of taking a cash inheritance, they join a dangerous clue hunt. From that point on, the series becomes a race through museums, tombs, libraries, and old battlegrounds, with rival branches of the Cahill family all trying to get there first.

That setup gives the books their particular flavor. Part puzzle chase, part spy story, part history tour, they move fast and keep the chapters short. Real historical figures and places are woven into the hunt, but the real engine is always the same: Amy thinks ahead, Dan rushes in, and together they keep stumbling into bigger truths about their family than either of them expected. Because the Cahills are split into competing branches with long memories and old grudges, Amy and Dan are never just looking for clues. They are also trying to learn which relatives are helpers, which are rivals, and whether winning would even be worth what it asks of them.

Linda Sue Park's contribution to this first arc comes near the end, which makes it feel different from an entry-point book. Storm Warning is book nine of the original eleven-book run, so Amy and Dan are already tired, suspicious, and carrying the weight of everything that came before. Park drops them into a high-seas search for treasure that also pushes the larger mystery forward, especially around the Madrigals and the man in black who has haunted the series from the edges.

Because this is a late-series installment, the stakes are more personal than they first appear. There is still travel, danger, and the fun of historical breadcrumbs, but there is also a strong sense that the walls are closing in. Friends may not be exactly what they seem. Old family stories start to connect. Answers finally begin to cost something.

Different writers handled different books in The 39 Clues, and part of the fun is seeing how each author uses the same shared playground. Park keeps the pace the franchise is known for, but she is especially good at making the emotional thread easy to follow even when the plot is moving at full speed.

This is not the best place to start the franchise.

If you want the complete experience, read Storm Warning after the earlier books in the main clue hunt. If you are here because you read Linda Sue Park first and want to see how she writes inside a big shared-universe series, this page will help. We focus on her entry, explain where it lands in the wider arc, and show why it matters so much to the final stretch of Amy and Dan's story.