The protagonist Damon Yorke, played by Greg Lock is a young but highly valued and experienced London based paramedic. Damon is having some relationship problems with his girlfriend Clare and is being forced to attend couples counseling. Damon is advised to try phoning Clare just before she goes to bed, whilst he is on shift work, just to reassure her that he is okay and that he loves her. However, on the first night shift when he wants to try this new system he accidentally leaves his phone at home.