Beka decides to leave the crew to fight for themselves, but after all of the promises that everyone will be reunited, Trance tells them that they will never be as they are again. When the Magog Worldship finally re-encounters the Andromeda after two years, Rommie and Harper race to take the Arkology to slipstream, Rhade must teach the inhabitants to defend themselves, and Dylan and Trance fight off the invading Magog. But as the Andromeda becomes covered in swarmships, Trance tells Dylan that he--and only he--may escape this alive.
The Andromeda encounters the Arkology, a society that they believe is the closest to perfection humanity will ever achieve. But the Magog are close, and Dylan and the crew must convince the utopia that peace is not the answer. Conflict arises in the core crew when the leaders of Arkology do not wish to leave. Dylan wants to defend them, and Beka warns him that she's not going to stay and die defending an idea of peace.
While on a mission on the Maru, Dylan, Rhade and Harper (and the Maru) are captured by the Templars. The Patriarch of the Templars presses Harper to help him build a bridge -- a time bridge to 210 years in the future. However, sometimes even the future is unpredictable. Meanwhile, Beka, Trance and Rommie chase down smuggler ships.
After being repeatedly attacked by bounty hunters after several evasive slipstream jumps, Dylan determines that there must be a mole on board. After analyzing data recordings, he discovers that Beka has been infected by The Abyss and has unknowingly been giving away Andromeda's position. Dylan and the crew have to come up with a way to rid Beka of The Abyss -- without killing her.
The Collectors have been using a drug to modify people's behavior, discovering their fears in efforts to control or break them. This is their solution for dealing with Dylan. Led by a message from Rev Bem, claiming to have a weapon that can defeat the oncoming darkness, Dylan lands on a drug-trafficking planet and is soon taken captive by the Collectors.
The crew rescues two people from a spaceship, the leaders of opposing sides in a long civil war on a nearby planet. The two warring sides have built an immense wall separating the northern and southern halves of the planet, and the Northerners are suffering from a plague that is blamed on the Southerners. After Dylan contracts the plague, the crew try to assist in settling the dispute and find a cure for the plague, but nothing goes as planned.
A seemingly psychotic ""Collector"" simultaneously takes credit and blames Dylan for the fall of the Commonwealth. He also claims to be hosting (or holding captive?) the Triumvir Tri-Jema. The crew must decide whether to accompany Dylan on yet another odds-defying journey to save the Universe or to retire in relative safety.