Cambium

This is an Apple Books audiobook narrated by a digital voice based on a human narrator.

The Matriarch of Blackheath isn't just dying. It's bleeding.

Julian Farrow is a disgraced dendrochronologist, a man who reads time in the rings of ancient wood. Exiled from academia, he finds himself summoned to the Blackheath Estate in Cornwall by the reclusive Isolde Craggs. Her request is simple: diagnose the sickness rotting the "Matriarch," a colossal, unclassified tree kept within the estate's stifling Victorian glasshouse.

But the Matriarch defies biology. Its bark is pale and soft, warm to the touch like fevered skin. When Julian drills into the trunk to take a core sample, the tree doesn't produce sap. It bleeds—a thick, crimson fluid that smells of iron.

As the humidity in the glasshouse rises and the tree "groans" in the night, Julian uncovers a horrifying history of surgical grafting buried in the estate's archives. The Craggs family didn't plant this forest; they became it. And Julian wasn't hired for his expertise. He was hired for his compatibility.

The Matriarch is hungry for a new limb, and Julian is the perfect scion.