Thieves are humans* with special abilities to strike a deadly blow from behind, climb sheer surfaces, hide in shadows, filch items and pick pockets, move with stealth, listen for noises behind closed doors, pick locks and remove small traps such as poisoned needles. Every thief has these abilities, but as they progress in experience they become better and better at it... Thieves are not truly good and are usually referred to as neutral... so that other members of an expedition should never completely trust them and they are quite as likely to steal from their own party as from the Dungeon Master's monsters. Thieves can wear nothing stronger than leather armor and can not carry shields. They can use all the weapons of a fighting man including magic swords and magic daggers. Thieves above the third level of experience can read magic scrolls and books and 80% of languages so that treasure maps, etc. are easy for them. - Holmes, pg. 6
* Halflings, dwarves, & elves, can also be thieves.
