Seven months after our divorce, I rushed into St. Jude’s Children’s and Women’s Hospital, still angry at my ex-wife, only to learn that she had just given birth to twin boys, and both of them were mine. Before the night was over, a nurse would place a brass key in my hand and tell me to use it before my own family arrived. And what was waiting for me beyond that was even more shocking.

The stone steps led down into a narrow brick-lined tunnel running under the garden.

Water had seeped through the old brickwork in a few places, leaving small puddles, but the arched structure was still completely solid.

After we had walked about thirty yards through the damp passage, the tunnel opened into a small, dry underground chamber.

There was no fancy furniture inside.

There were no wooden storage shelves or legal filing cabinets.

There was only a solid stone bench, an old oil lantern sitting on a pedestal, and a heavy oak door with a brass plate bearing the embossed oak tree symbol.

I stepped forward, slid the brass key into the center lock, and turned it.