Series: The Chronicles of the Imaginarium Geographica.

Book: Here, There Be Dragons.

By  James A. Owen.
****

What I like about it: The mix of fantasy and history.

Plot: Three scholars named John, Jack, and Charles are entrusted with the mantle of Caretakers to the Imaginarium Geographica ( Imaginary Geography ), a geography to all the islands in the Archipalego of Dreams, in which there are many different items, animals, and people. The caretakers then go on a mission to save the Archipalego from the evil Winter King, in which they meet many friends and foes.

P.S. There is some violence, so I suggest waiting till you're 10 to read it.