sex : male.
age : 55 (a guess).
native planet : Sol 3.
Lithos is a Federation agent, the commander of the London base.

When we did the mission in Scotland, we found out that the Federation had an agent in London, and he had powerful friends.  See Report 12.

We only knew him as Lithos.  We didn’t know his real name, but we were with Lord Eaglesham when he had a phone call from Lithos, and Lord Eaglesham knew him – Sir Alan Stone.  At the time, I said:  Although I wasn’t often on Earth, I had heard of Sir Alan Stone.  I hadn’t a clue about what he did, but I knew he was important. See Report 32.