He had the hood of his gray sweatshirt pulled over his hair and stood in the doorway until Wyatt waved him in.

For a moment I saw them side by side, tall and narrow-shouldered with the same slight notch in their left eyebrows.

I’d once thought the resemblance funny.

Now I could barely look at it.

“You two don’t have to solve this today,” Dr.

Ruiz said.

“And you each get to decide whom you tell.

A genetic result can change facts about ancestry.