|title=The Voice of the Spirits: A Commandant de Palma Investigation
|sort=Voice of the Spirits: A Commandant de Palma Investigation
|publisher=MacLehose Press
|date=March 2012
|amazonuk=<amazonuk>085705077X</amazonuk>
|amazonus=<amazonus>085705077X</amazonus>
|website=
|video=
|summary=1936: An explorer and his guide flee from head hunters in Papua New Guinea. 2006: A famous surgeon is murdered in an unusual way. Finding the connection may uncover the killer. At least that's what Commandant de Palma hopes in this real page turner with more depth than the average crime thriller.
|cover=Bonnot_Voice
|aznuk=085705077X
|aznus=085705077X
}}
In 1936 explorer Robert Ballancourt and his guide Kaingara visit a tribe of head hunters in Papua New Guinea. Ballancourt, seeking artefacts to sell on to museums, is drawn to the highly decorated skulls venerated by the tribe as they hold the spirits of dead ancestors and conquered enemies.