Gemma was a forensic expert assigned to the team. Young and good looking, she surprised people by choosing a job that means searching for clues among dead bodies. She worked with confidence and a detached fascination and got tremendous satisfaction from finding hidden evidence to help catch the killer. She made her first on-screen appearance in the episode Saints and Sinners and needless to say, Robbie never lost the first opportunity to flirt with her. In Compensation, she and the forensics team got lost on the way to the village of Fennmore and Robbie had to tell her which way to go.