Elena had spread six photographs across the wood.

“These came from the unit,” she said.

“The chair module, the bedroom module, and four more from the upstairs office.”

I picked up the closest photograph.

The device was smaller than a deck of cards, a black rectangle with a metal bracket screwed into the wood.

“That’s what was under Sophia’s chair,” I said.

“The bracket is a mount.

The module clicks into it.”