From the Publisher:

In Voices In My Head, players step into the courtroom and into the mind of a man on trial for robbing a bank. One player takes on the role of the prosecutor who is trying to convict the defendant, Guy, and send him to prison; everyone else takes on aspects of Guy's personality, such as Honesty or Selfishness, and attempts to influence the trial. To win the game, each player must achieve their hidden goal.