Showing Trophies and Dead Things by Marcia Muller

When a former sixties radical is murdered during a string of random sniper attacks, the All Souls Legal Cooperative must settle his surprisingly large estate. P.I. Sharon McCone comes across a new will, made just days before he died, that disinherits his two children in favor of four unknown and unconnected parties. McCone sifts through Perry Hilderly's belongings, but finds little to explain this puzzling change -- until she uncovers a .357 with the serial number burned off. As McCone tracks down the new beneficiaries she discovers that the shootings aren't so random after all and that the dead man isn't the only one with a lurid past. To find the killer, she must follow a treacherous trail of evidence that travels from the Vietnam years to the present. But along the way the elusive sniper waits in a homicidal rage and takes aim -- this time at All Souls and Sharon McCone.