Broken: A traumatised girl. Her troubled brother. Their shocking secret.

Nine-year-old Archie and his five-year-old sister, Bobbi, are taken into emergency police protective custody after an incident of domestic violence at their family home.

Rosie collects the children from their out-of-hours foster carer on New Year’s Day and instantly recognises Archie from a domestic violence workshop she helped with. Rosie remembers that when asked what he enjoyed most about the course, Archie said: ‘the biscuits’.

Social workers are concerned that Archie and Bobbi have be...