You need "improved discern location" from the Bluffside sourcebook.
(the following is declared open game content as per the rules dictated in the section 15 of the Bluffside sourcebook)
Improved Discern Location
Divination
Level: Clr 9, History 9, Knowledge 9, Sor/Wiz 9 Components: V, S, DF
Casting Time: 10 minutes
Range: Unlimited
Target: One Creature or object
Duration: Instantaneous
Saving Throw: None
Spell Resistance: No
Improved discern location works just like the 8th level discern location with the exception that the caster does not have to have seen or touched the person or item previously. The caster only needs a complete understanding of the item or creature to be located. Complete understanding needs to be specific or the spell will fail. Examples include “the brother of the king” (assuming the king has only one brother) or “the other half to this sword” if the caster has half a sword and is missing the other half.