High in the Austrian Alps a solo pilot flies his high tech aircraft into a cloud filled canyon. A driving snow storm doesn't prevent a computer specialist leaving his car to walk into the Black Forest. Guided by satellite navigation both are drawn to an appointment they dare not miss. A tragic accident above the Denver skyline puts the head of the Global Geocache Society into a coma triggering a deadly game across Europe as Victoria Kavanagh, his Chief of Security, races to find a rare donor. Alerted by an Interpol Code Purple warning, Inspector Sean Mason gives chase to a predator, only to cross paths with Victoria. Can she be trusted or is she the one he is pursuing?