Detective Inspector Jack Grace is a recurring police officer in 'Prisoner'
- First appeared in ep 8 to tell Helen Masters that he had found her vehicle and it had been involved in a hit-and-run accident.
- He then appears again in ep 14 to deal with car accident involving Lynn Warner.
- He is seen in ep 46 arresting Denise Crabtree for handling stolen money.
- He returns in ep142 to talk to Tracey Morris as part of the drug squad.
- In ep 215 he interrogates Kathy Hall regarding possible involvement with small-time crooks.
- Ep 220-224 regarding Kathy Hall's murder and Terry Harrison's aswell.
- He interrogates Sandy Edwards about Meghan Arnett's disappearance in Ep 243.
- Ep 244 he meets Kate Peterson who offers her "services" to him in exchange for a false witness. She tells him where Sandy Edwards dumped Meghan's body. They meet regularly after that.
- Ep 263 he informs Erica Davidson about the drug-trafficking at Wentworth being organized by the 'McNally Gang' and Marie Winter, which now has ended. He also informs her about his activities with Kate Peterson and that she is going to be charged with trying to prevent justice.
- Ep 297 questions Judy Bryant at the police station regarding Donna Mason and later Susie Driscoll.
- Ep 635 investigates Andrew Hinton's murder and questions Jenny Hinton and Joan Ferguson hoping to put Harry Parker behind bars.
- Ep 164 Meg Morris calls him David
- Ep 566 Howard Simmons asks about his ex-wife Val