A Sealed Chamber. A Hidden Fragment. A Truth They'll Stop at Nothing to Bury.

At seventeen, Ava Calloway can read a code no one else alive can: the Alexandria Cypher, built together with her father and shared with no one but the two of them.

Nothing could prepare her for where it leads — the discovery beneath Alexandria. A hidden chamber, untouched for centuries, holds a fragment tied to Mary Magdalene. For two thousand years, people have rewritten, debated, and deliberately suppressed the life of this figure. What Ava finds could shake the foundations of history itself. But some will do anything to ensure it never sees the light of day.

Drawn into a dangerous web of secrets is Marcus Visconti, heir to a lineage of scholars sworn to protect Christianity's most closely guarded truths. Together, Ava and Marcus unravel coded warnings, long-forgotten archives, and hidden manuscripts, racing across Egypt, Rome, and Switzerland.

For fans of Kate Mosse, Brad Meltzer, and Deborah Harkness, The Alexandria Cypher delivers a heart-pounding journey of mystery, history, and suspense.

A Father's Lock. A Dying Fragment. A Truth They'll Stop at Nothing to Bury.

Forty-seven hours. That's how long Ava Calloway has before the relic sealed beneath Jerusalem crumbles to dust and takes a fifteen-hundred-year-old secret with it.

She's the only one who can open it. The seal answers to her bloodline, and to two keys her father hid apart before he vanished; kept separate so no single hand could ever turn them alone.

Now Ava has his journal, the code only the two of them can read, and a single partner as hunted as she is.

The trail runs fast and dark, from the tunnels beneath Jerusalem to the porticoes of Bologna to the flooded cisterns under Istanbul. Some want the fragments sealed away forever. Others want them seized and controlled. Ava stays a step ahead of them all, but the closer she comes to the truth, the more it costs to keep moving.

One wrong move, and the secret her father gave his freedom to protect is gone for good.

The history is real. The conspiracy is human. The stakes have never been more personal.

For fans of Kate Mosse, Brad Meltzer, and Deborah Harkness, The Alexandria Cypher delivers a heart-pounding journey of mystery, history, and suspense.