In this series finale, pathologist Dr. Lily Robinson races around the globe to hunt an assassin who, like her, finds poison the weapon of choice.

A world-renowned climatologist is found dead off the Great Barrier Reef of northern Australia weeks before he's set to deliver his earth-shattering findings at the international Climate Council conference. Was it greed to maintain the status quo of fossil fuels—or revolutionary new science—that motivated his murder? Can Lily Robinson stop the killer before another climate scientist dies?

With operative and lover JP Marchand at her side, Lily uncovers a cunning plot that endangers world order, and changes the trajectory of her life—forever.