'Deceit', written by Peter Darvill-Evans, features the Seventh Doctor, Ace and Bernice.
Back Cover Blurb
'Take Arcadia apart if you have to'
The middle of the twenty-fifth century. The Dalek War is drawing to on untidy close. Earth's Office of External Operation is trying to extend its influence over the corporations that have controlled human-occupied space since man first ventured to the stars.
Agent Isabelle Defries is leading one expedition. Among her barely-controllable squad is an explosives expert who calls herself Ace. Their destination: Arcadia.
A non-technological paradise? A living laboratory for a centuries-long experiment? Fuel for a super-being? Even when Ace and Benny discover the truth, the Doctor refuses to listen to them.
Nothing is what it seems to be.