Tomes in Amber
Thieves of the Gods
The Thieves of the Gods firmly believe that the items in the Archive are there because they are too dangerous for the mortal world. They also believe that it is their duty to seek out and acquire other such items that may appear in worlds outside the Archive, and place them within for safe-keeping.
The Thieves have an outpost in Parchments which is not kept particularly secret. The Thieves let their reputation keep them safe. They also have hidden vaults and warehouses, but this one is large and is the place to go if one wishes to contact them.