After evading an attack by Cassini Pirates, the Liberator heads to the rogue moon of Quentil, where Avon and Vila infiltrate a top secret Federation science facility.

Vila assumes the guise of Doctor Yarding Gill, an expert in digital memory. And Avon is his 'creation' - a super-advanced android that could pass for human. In fact, he does...

Can they maintain the ruse for long enough to complete their mission? And will the Cassini Pirates catch up with them?