Set in the Viking world of long boats, looting and grand adventure, The Goose Pimple Bay Sagas relate the hilarious tales of a noble family with a difference. In the final book of the quartet, a message reaches Goose Pimple Bay that Chief Thunderstruck is in trouble. He's been trapped in a cave on an ice flow by a fierce polar bear, who has a nasty glint in his eye when he looks at Chief Thunderstruck's bearskin coat. Together Whiff Erik, Spike Carbuncle and Fangtrude sail off to the rescue. But it's up to Fangtrude, being part wolverine, to save the day.
Karen's first novel for older readers, Raspberries on the Yangtze was short-listed for the Guardian Children's Fiction Prize. The first in her series for younger readers, The Crunchbone Castle Chronicles, published by A&C Black, was selected for the Summer Reading Challenge in 2006.