The Economy of Light by Jack Dann is about an holocaust survivor turned Nazi hunter obsessed with seeing Joseph Mengele served justice. Apparently seeing the bones from Mengeles grave he’s still not satisfied, having spent a lifetime searching for the man who killed his mother and brother; but he’s old and dying. His South American friends offer one last hope — a vague story of a doctor in the Amazon who may be able to help him . . . one way or another. The premise hooked me and I enjoyed the richly described trek up the Amazon and through the jungle, like an old adventure novel updated. Can’t say much more without spoilers; I’m glad I read it.