The Lost Treasure of the Templars (James Barrington) Books in Order

The Lost Treasure of the Templars trilogy, written by James Barrington as James Becker, is a contemporary historical-conspiracy series centered on two very different problem solvers. Robin Jessop is an antiquarian bookseller with an instinct for the value and oddness of old objects. David Mallory is a mathematician and code specialist who sees patterns where other people see noise.

Neither is looking for a Templar mystery.

In The Lost Treasure of the Templars, Robin buys what appears to be an old medieval book for her coastal shop. It turns out to conceal a safe, and the safe contains a coded parchment. The discovery pushes Robin into danger before she understands why the document matters. David becomes essential when the writing proves too complex to decode by intuition alone.

The pair quickly find that the title's treasure is not necessarily gold. The Templars dealt in property, money, promises and information, and their surviving records could expose the foundations of old power. That makes the documents valuable to people who would rather keep the past safely sealed away.

The Templar Archive develops this idea. Robin and David pursue fragments that point toward records of ownership, debt and family agreements. The clues pass through churches, archives and carefully guarded private spaces. Their work calls for patience and close reading, but the danger comes from people who are prepared to use force when patience fails.

By The Templar Brotherhood, the consequences of the earlier discoveries have grown. The search reaches further into the traditions and loyalties that formed around the order's downfall. The series uses occasional scenes from the fourteenth century to show the original betrayal, then returns to the present to show why old documents still have the power to threaten modern lives.

Robin and David give the books their balance. She understands rare books, provenance and the quiet networks around the antiquarian trade. He works through encryption, logic and probability. They disagree, learn to rely on each other and remain grounded even when the historical stakes become enormous.

This is a series for readers who enjoy hidden rooms, coded manuscripts and the practical work behind a treasure hunt. Start with The Lost Treasure of the Templars and read in order. Each book has its own main puzzle, but the discoveries build on one another, and the relationship between Robin and David develops alongside the larger Templar storyline.