An innocent shopping jaunt for the Doctor and Peri ends in violence and incarceration as they become caught up in a mysterious transaction involving the sale of co-ordinates leading to Rovan's hoard - the ultimate treasure. 

But there are several parties heading for Gelsandor and some of them will stop at nothing to find the treasure. Only the Doctor is sceptical: what will they find - and why has nobody found it before? 

Gelsandor turns out to be a planet with a whole host of tricks, traps and deadly surprises, testing the Doctor and Peri to their limits. 

Featuring the Fifth Doctor and Peri, this adventure takes place between PLANET OF FIRE and THE CAVES OF ANDROZANI.