Jupiter's Bones - Faye Kellerman

Peter Decker-Rina Lazarus mystery takes police lieutenant Decker into the enclave of a Heaven's Gate-style pseudoscientific religious cult, the Order of the Rings of God. The cult's leader, a former world-class physicist who styles himself Jupiter, has died of an ungodlike combination of liquor and prescription drugs, but whether it was accident, suicide, or murder is suspiciously murky. The death is mysteriously reported by Jupiter's estranged daughter Europa, a scientist who has nothing to do with the cult, and when the police arrive on the scene, they find that Jupiter's followers, particularly his four unpleasantly ambitious personal attendants, range from uncooperative to downright hostile.