Merry Wrath's troop is going Down Under! When young Mayor Ava of Who’s There, Iowa gets a call for help from Mayor Sheila of their sister city in Doover, Australia, the girls in the troop waste no time in packing their bags for a trip halfway around the world—of course, with their fearless ex-CIA agent turned Girl Scout leader, Merry Wrath, in tow. Merry thinks this is a great opportunity to see another part of the world with the girls and her more-than-slightly-koala-obsessed co-leader, Kelly.
Met by Sheila, her Girl Guide troop, and a few kangaroo bodyguards, Ava and the girls get to work to help the mayor fight her obnoxious City Council. While the girls assist Sheila, Merry and Kelly plan to spend the time looking for koalas and taking in the sites of the Blue Mountain town in New South Wales. Being in another hemisphere, what could possibly go wrong?
Unfortunately, even halfway around the world, Murder Magnet Merry lives up to her reputation, when one of the council members' bodies is found in the bush. To make things worse, the police think Mayor Sheila is the murderer! Merry and the gang race to find a dangerous killer before they have to go home and Sheila goes to jail!