A section of the super volcano under Yellowstone erupts after thousands of years, putting millions at risk, and it's up to Rangers Charlie Young and George Howe to save the day.

Sacrifice is the story of consultant surgeon, Tora Hamilton, who moves with her husband, Duncan, to the remote Shetland Islands, 100 miles off the north-east coast of Scotland. Deep in the peat soil around her new home, Tora discovers the body of a young woman with rune marks carved into her skin and a gaping hole where her heart once beat. Ignoring warnings to leave well alone, Tora uncovers terrifying links to a legend that might never have been confined to the pages of the story-books.

At eleven years old Joe Norman is told by his dying father that he is an alien hiding on earth. Joe believes him. He grows up to be a die-hard fan-boy working in a comic shop. When he falls for down-to-earth Maria, a fellow sci-fi fan, he is inspired to lead a more normal social existence. Until intergalactic bounty hunters track Joe down at his new office and the couple soon learn the dangerous truth about who Joe really is.