“What is it, Adrian?” she whispered, her hand tightening on Lila’s back.

“Don’t touch it,” I said.

I looked at the seam running along the edge of the silver heart.

It was too clean, too precise for a standard piece of jewelry.

I used the edge of my thumbnail to pry at the groove.

With a small click, the back of the pendant popped open.

Inside, nestled in a hollowed-out compartment, was a tiny green circuit board.

A miniature copper coil was wrapped around a microscopic battery.

A red light on the board blinked once every three seconds.

“A transmitter,” I said, my voice cold.

Nora gasped, covering her mouth.

“How long has she been wearing this?” I asked.

“Elena gave it to her last month,” Nora said, her voice shaking. “She said it was a gift for her birthday.”

The puzzle pieces fell into place.

Elena had not just been Caleb’s mole in the kitchen.

She had been tracking Lila’s exact coordinates inside the estate.

Every time we tried to move Lila to a safer sector, Caleb’s men knew her location within meters.