Listen command
From ThresholdRPG Wiki
If no target or object is given, you will listen around your current environment. If you specify a target (which could be another player, an NPC, an object in the room, or something mentioned in the description of the room), you will listen to that target more closely.
Usage
listen
listen <target or object>
Special Note
See also: look, smell, taste, touch, feel, glance
Help File
help listen