The early hours of a freezing January night. Special Constable Jane Bell is at the end of a busy late shift when she's called out to investigate strange noises in a local park. She finds a wailing new-born baby girl dumped in a plastic storage box.

That same night Detective Steph Warwick attends the murder of coach driver Bernie Gore, whose battered body is found in a narrow alleyway.

The last thing Jane wants is to lock horns with Steph Warwick once again. Then vital evidence emerges linking Bernie Gore's murder to the abandoned baby. And Jane has no choice but to alert the sharp-tongued detective inspector.

To solve Bernie's murder and track down Baby Elsa's mother, the two women must bury the hatchet and learn to work together.

Matters become even more complicated when a prime suspect emerges - with close links to Jane's family.