Management makes a historic decision. Emily sends a warning. Quayle, Clare and Temple investigate the final Indigo cell. Howard Prime reaches out to an old contact.
The espionage thriller follows a man named Howard Silk, a lowly cog in the bureaucratic machinery of a Berlin-based UN spy agency. When Howard discovers that his organization safeguards the secret of a crossing into a parallel dimension, he is thrust into a shadow world of intrigue, danger and double cross. The only man he can trust is 'Prime', Howard's near-identical counterpart from this parallel world.