Emma Hedges' return to Dundee brings her mother's unsolved murder into sharp focus, but a fatal fire in a nightclub proves an ominous omen.

Glad of McKinven's help, Emma soon feels overwhelmed by the police interest and wonders what she's started. But when the stars align to put Daniel in her path, Emma feels a deep connection.

Emma's digging ruffles a few feathers and when she is threatened with a knife, it's clear that someone's hiding something.

Daniel's facing his own troubles between the police and his father Phil, while Emma starts to trust her instincts.

Emma's suspicions start to drive a wedge between her and those she's closest to, while McKinven urges Emma to stop sleuthing.

McKinven gets the lead he needs to make an arrest but it's the exacting forensic science that finally brings peace for Emma.