When Emily Andrew lands in the Land of Oz -- Australia, that is -- she and her hearty group of world-touring seniors know they're not in Iowa anymore. Winter is summer, drains drain counterclockwise, and all the comforts of home are, well, back home. Even Emily's love life is upside down: her darling detective Etienne Miceli has yet to propose, while gorgeous tour director Duncan Lazarus is vying to be more than just mates.

Emily is preoccupied calming the group's jitters about the outback's killers, from sunstroke to snake bites. But when a fellow traveler turns up dead, Emily fears something far more toxic has struck: human greed. Someone has stumbled upon a natural wonder that could turn science on its head -- was this priceless discovery the catalyst for murder? Before the dust settles, a second untimely death occurs. If Emily can't stop a killer in their tracks, this Aussie adventure just may be her last.