Saint Thomas
Miniature from a fifteenth-century breviary.

Acts of the Holy Apostle Thomas
This first-century book was not accepted as Scripture, largely because it alleges that St. Thomas baptized with oil only, not water. Recounts St. Thomas's missionary journey to India.

Thomas
What happened to St. Thomas after Pentecost is unknown. . . but there has certainly been a lot of speculation.

Thomas the Apostle
Illustrated profile, with links.