The Shield of Weeping Ghosts is the third book in The Citadels series. It was written by James P. Davis and first released on 6th May 2008.
The past will come back to haunt them...
A group of warriors from Rashemen escorts an exiled wizard to a ruined citadel in the City of Weeping Ghosts. Once there, the wizard discovers a barbarian tribe is trying to unlock the secrets of the citadel and the weapon that destroyed it two thousand years ago.