A smart, sassy self-appointed private investigator, Cass Tuplin is unforgettable and the town of Rusty Bore will never be the same... Cass Tuplin's takeaway isn't the last shop left in Rusty Bore. There's also Vern's General Store. But it's true the town's not exactly overflowing with residents, and a stranger in Cass' shop is quite an event. Especially one like Clarence: suspicious, bleeding, looking for a burger with the lot and somewhere quiet to stay. Cass knows just the place. Then she finds out more about Clarence and wants him out of town, but it turns out that's not as easy as it sounds.

On the night Leo Stone returns—notionally from the dead, in reality from the Democratic Republic of the Congo—Cass Tuplin gets a call from Gary Kellett. A call about an actual dead person: Gary’s daughter, killed in a car crash. Gary’s adamant it wasn’t an accident. Cass agrees to investigate. After all, not just Rusty Bore’s only purveyor of fine fast food, Cass is also the closest thing to a private detective within a couple of hundred k’s. The local police (Cass’s son Dean) try to warn her off. It’s true Cass’s status as a celebrated yet non-licensed nobody doesn’t entirely suit Dean. But Dean also believes Gary’s a delusional, grieving father. Is that the case? Or did a young journalist die after asking too many questions? Cass intends to find out. As soon as she’s dealt with some queries raised by the reappearance of Leo Stone.

For Cass Tuplin, proprietor of the Rusty Bore Takeaway (and definitely not an unlicensed private investigator), it’s weird enough that her neighbour Vern has somehow acquired a lady friend. But then he asks Cass to look into the case of the dead rats someone’s dumped on Joanne’s doorstep. She’s barely started when Joanne goes missing, leaving hints of an unsavoury past. Then a private investigator from Melbourne turns up asking questions about Joanne’s involvement in a fatal house fire—and before you can say ‘unauthorised investigation’ Cass is back on the case.

It’s a mostly normal Friday evening in the Rusty Bore Takeaway. Cass Tuplin’s cleaning down the grill when her glamorous sister Helen walks in, all bones in an Italian-weave suit and the kind of state that calls for the full comfort: double bacon cheeseburger with extra chips. It’s man trouble as usual. But this time it turns out the trouble is less emotional and more fatal. Helen’s boyfriend has been pushed off the rooftop terrace of his Fitzroy apartment, and Helen’s trying not to become a person of interest. She’s also trying to retrieve something rare and valuable from Ben’s place—which is where Cass comes in. Cass doesn’t do investigations anymore, of course, being unlicensed. And she’s not particularly keen on breaking into a crime scene, even if it’s not strictly breaking when you’ve got a key. On the other hand, Helen is her only sister. And she has been getting Cass into trouble for more than forty years. Why stop now? But this time Helen’s little problem will drop Cass into deeper trouble than ever before.