Storm Harvest

Storm Harvest is a BBC Books original novel written by Mike Tucker and Robert Perry and based on the long-running British science fiction television series Doctor Who. It features the Seventh Doctor and Ace.

Plot summary
The water world of Coralee seems to be the perfect place for Ace and the Doctor to take a vacation. The Doctor goes off to assist in an archaeological expedition. This uncovers clues to something that threatens the entire planet of Coralee.