There are 3 books in the Stone of Tymora series. The newest book is The Sentinels which came out in 2010.

1
The Stowaway

By R. A. Salvatore , Geno Salvatore ,

Book cover of The Stowaway
From the author of more than a dozen New York Times bestsellers comes the first installment in a thrilling fantasy trilogy written for young readers

Barely a teen and already guarding a secret that could jeopardize his young life, Maimun is marked for death. With the help of a mysterious…
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2
The Shadowmask

By R. A. Salvatore , Geno Salvatore ,

Book cover of The Shadowmask
Cross swords with a blue-skinned pirate and unravel the mystery of the masked spellcaster in this second book of the Stone of Tymora trilogy!

Though robbed by a masked spellcaster and left for dead by a demon, twelve-year-old Maimun refuses to give up the magic that rightfully belongs to him.…

3
The Sentinels

By R. A. Salvatore , Geno Salvatore ,

Book cover of The Sentinels
The lightning-paced conclusion to the Stone of Tymora trilogy by best-selling author R.A. Salvatore and his son...

After dueling with a dragon and a demon, Maimun knows he must destroy the stone that has kept him on the run for most of his life. The question now is how. With…