Toxic Prey A Prey Novel Book 34 by John Sandford

It sounds like you're describing a synopsis for a thriller novel featuring Lucas Davenport and his daughter Letty, written by John Sandford. In this latest installment, Dr. Lionel Scott, a renowned scientist, believes that Earth (referred to as Gaia) is dying due to unsustainable human practices and population levels. His radical views lead him to develop a dangerous virus as a means to curb what he sees as humanity's destructive impact on the planet.

When Dr. Scott disappears unexpectedly, Letty Davenport takes on the task of tracking him down. His connections to sensitive research on viruses and pathogens put national and international agencies on high alert. With her father Lucas Davenport's assistance, they delve into a complex web of conspiracies and dark connections surrounding Dr. Scott's disappearance and his potentially deadly creation.

As they unravel the mystery, Letty and Lucas uncover shocking truths and race against time to prevent Dr. Scott's virus from becoming a catastrophic weapon. The novel seems to blend elements of suspense, scientific intrigue, and the urgency of preventing a global catastrophe, typical of John Sandford's gripping thriller style.