A/N: Even though Teddy is mentioned, this is set in the present time.
Brennan brought Booth a Scotch and curled up next to him on the couch. "Did you visit Teddy's grave today?"
Booth looked at her with mild surprise. "I didn't think you'd remember that anniversary was today. Yeah, I went out to see him...to talk to him. To tell him thanks."
"I remembered about Teddy because of the Gravedigger kidnapping you. But I don't understand. Even if Teddy could hear you, why would you thank him?
"I don't think I can explain it right so you can understand…"
"I know it's important to you. That's enough for me."
Booth shifted uncomfortably in his seat. "I know you think that I saw Teddy because the conditions on that ship made me see things, right?"
She nodded. "The chemicals from the materials on the ship and lack of oxygen in addition to your tumor impaired your brain function."
"I know that's the logical, rational explanation, but maybe there's another explanation. I think Teddy was sent as some sort of guardian angel. I know you don't believe in that sort of thing, but I do. Anyway, no matter what caused Teddy to show up, he helped me get off the ship, and now I have a great life and family."
"Booth...that makes no sense. You were hallucinating…"
"If I was hallucinating, why would I see Teddy? I didn't want to see him. I felt responsible for his death. If I was having an hallucination, I think I'd see someone I love...like you. I think God sent Teddy to help me."
Brennan put her head on his shoulder. "You're right, Booth. I don't understand. I don't believe in God, angels or ghosts, but I know from reading your report that something helped you survive. I can't explain it, but whatever what it was, I'm thankful, too."