Somebody Murdered Maggie

A toddler cries but is ignored by his young mother. Maggie's in another room, dead. The Homicide Squad led by DCI John 'Robbo' Robertson arrives. Who murdered Maggie? She struggled as a single mother and mixed with nasty characters. And when the PM revealed Maggie was pregnant, it becomes a double homicide.
As the detectives tackle a list of suspects, the new police pathologist, the aptly-named chocoholic Dr Gabrielle Strange, reckons a motor cyclist who crashed at speed was actually murdered. Really? So detectives face separate homicides with more suspects than red herrings. And when some killers discover they've murdered the wrong victim, we've got cops chasing crooks chasing crooks. Look out, he's behind you!
Robbo's youngest granddaughter is Joanna Best, aged 6. As the detectives struggle to solve both homicides, Joanna and her sister visit their Pop and score a chocolate frog. Little Joanna sees a photo on Pop's desk and asks a simple question which turns one of the homicides on its head. Out of the mouth of babes and sucklings …
It's not surprising that years later, Joanna Best joins Victoria Police with the dream of one day following her Pop and becoming a homicide detective. She does, and this is where it all began.