The Murder Investigation Team is called in when Ed Villarin, a young Lithuanian, collapses and dies in the street during a game of 'phone tag', in which strangers join the game over the internet and must 'hunt' and photograph the 'target' with their mobile phone.

The Murder Investigation Team uncover a vipers' nest of malpractice and drug dealing after a popular registrar, Karl Anderson, is pushed off a hospital roof.

Sexual tension among the Murder Investigation Team is revealed when a crime scene colleague is found strangled in her flat.