Can Dr. Siri solve the mystery surrounding a rash of killings before he, too, becomes a victim? Things have been pretty hectic for Dr. Siri. Now he's off on what he calls a ''therapeutic holiday'' in the mountains with his wife and friends. But sadly, there's no rest for the wicked; with the help of a little blackmail, they are accompanying an American MIA team. Their mission is to discover what happened to a stoned airman downed ten years earlier. Could he have survived? Who is eliminating the last people to have seen him alive? And who, we ask, is lighting the fires that are shrouding the Friendship Hotel in smog? In the remote Plain of Jars, surrounded by a thousand tons of unexploded bombs, Siri and the morgue team have to discover who the killer in their midst is before they, too, become victims.