Dwarves, Elves, Gnomes, Halflings and Half-Orcs can be multi-classed Fighter-Thieves. They are limited to 6th level.
Armour & Weapon Restrictions
Fighter-Thieves can wear leather or chain armour (but not heavy plate mail) and use single-handed weapons and also bows.
Fighter-Thieves gain Combat Fury like a Fighter when attacking creatures with 1 HD or less.
Fighter-Thieves can the Thievery power which they can use while wearing chain mail. They can Back Stab just like Thieves with any melee weapon.
Starting Abilities & Feats
For a starting ability, they receive both a Fighter Sub-class and the Thief’s Precision ability with daggers. They may choose Feats from any that are available to Fighters or Thieves.
Rangers gain a +2 bonus against Poison, Death or Traps.
Fighter-Thieves do not gain Trauma from the death of adventuring companions, searching corpses, negotiating with monsters or testing magical potions, weapons or armour.