A second of stunned silence stretched between them. Then, as if a trigger had been pulled, everyone moved at once.

Ricardo’s hand flew to his gun. Leonardo stepped protectively in front of Arya. Dolores unsheathed a hidden dagger from her belt, while Isabel squared her stance, ready for a fight. Roberto cocked his pistol, finger already on the trigger.

But Henry didn’t flinch.

Instead, he smiled.

And then—the ground shook.

A deep, guttural rumble echoed through the underground chamber, vibrating up their legs. Dust rained from the ceiling. The ancient stone beneath their feet groaned, as if something massive had just shifted deep within the earth.

For a fraction of...