Clairaudience

The clairaudience spell enables the caster to concentrate upon some locale and hear in his mind any noise within a 60-foot radius of that point. Distance is not a factor, but the locale must be known -- a place familiar to the spellcaster or an obvious one (such as behind a door, around a corner, in a copse of trees, etc.). Only sounds that are normally detectable by the caster can be heard by use of this spell. Lead sheeting or magical protections prevent the operation of the spell, and the wizard has some indication that the spell is so blocked. The spell creates an invisible sensor that can be dispelled. The spell functions only on the wizard's current plane of existence.

Note: This version of clairaudience originally appeared in the 2nd Edition Player's Handbook for Advanced Dungeons & Dragons from TSR. Its use here is for the purposes of providing context for the campaign only.