A new mystery to chill the bones-from the Edgar(r) Award-winning author of Unnatural Selection.
When forensics professor Gideon Oliver joins an Amazon riverboat expedition with a group of research
 botanists, he expects a nice vacation. What he gets is heat, corrupt officials, dangerous insects
 and animals-and worse.
As they travel upriver, one of the botanists is killed by a deranged passenger who leaps overboard
 and flees into the darkness. No one can explain why. Theories begin to simmer, and stories of 
long-past, half-forgotten grudges-and new ones as well-boil to the surface.
Only when a fresh skeleton turns up in the river, scoured to the bone by voracious piranhas,
 does Gideon realize that in this jungle full of predators, humans may be the deadliest of all
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