It’s the near future, and mankind has expanded its presence in space. Maintaining law and order beyond Earth is the responsibility of the International Space Police Force, known colloquially as the Star Cops.

Nathan and his team step up their investigations into the secretive and ruthless criminal organisation known as the Collective. As they come closer to identifying who’s in charge, with enquiries on Earth and in space, the Collective strikes back. The Star Cops must identify who is a friend and who is a deadly foe.

3.4 Old Flame, New Fire by Alison Winter
Earth leave in Liverpool is disrupted for both Devis and Paul when a figure from Paul’s undercover past comes back into his life. On Moonbase, an investigation into a contraband food additive leads Nathan and Kenzy into danger.

3.5 Grandma’s Footsteps by Katharine Armitage
Kenzy enlists the help of an old friend on Earth to follow a trail that could lead to the unmasking of the leader of the Collective. On the Moon, Nathan and Devis are dealing with a series of accidents that don't look very accidental - and that will force Devis to reveal a secret.

3.6 Escape and Evasion by Andrew Smith
The leader of the Collective is in custody on the Moon, with arrangements in hand for their transport back to Earth under armed guard. But an escape plan is in place. And the Collective’s operatives are prepared to kill anyone who gets in their way.