The Crumbling Tower

From publisher blurb:

Recently, caravans that supply Derrington Keep have been savagely raided by a group of bandits. Among the items ‘liberated’ during the bandit raids is a powerful holy relic of the god Cha’reth that was being transported to Derrington Keep for safeguarding by the clerics of Mikon. Outraged at the loss, the clerics commission the adventurers to find the bandits, retrieve the artifact, and rescue one of their own from the clutches of the mysterious bandit leader. All the while, the players must navigate their own way through the political mire of competition between deities and their followers.

Three to five characters of third to fifth level are optimal for this one-off adventure.