Nikki and Jack deal with their feelings post Mexico in very different ways.

Jack is boxing with his sparring partner, DCI Naomi Silva when he is called to a crime scene.

While Nikki is busy examining the body of a young woman Karen Sawyers, Jack is surprised to find the SIO on the case is Naomi Silva.

The first prime suspect, Karen's husband Pete, is found covered in blood and clearly suffering. The forensic evidence leads the team to a cosmetic clinic, where a pregnant Karen had been receiving various treatments seemingly free of charge.

Nikki and Silva soon become frustrated when Simon Laing, the CEO of Hamilton Ashe hospital, blocks their access to Karen's medical records. However, when a second body is found and all evidence leads back to Hamilton Ashe, Laing is forced to help the team.

Meanwhile, when Thomas's daughter Rosie unexpectedly turns up at the Lyell, Thomas has to deal with a more complex role... being a father.

A US diplomat is shot dead in a central London square, forcing the team to work closely with the embassy and the FBI and to overcome jurisdictional hurdles.