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The sentient warship Trouble Dog was built for violence, yet following a brutal war, she is disgusted by her role in a genocide. Stripped of her weaponry and seeking to atone, she joins the House of Reclamation, an organisation dedicated to rescuing ships in distress. When a civilian ship goes missing in a disputed system, Trouble Dog and her new crew of loners, captained by Sal Konstanz, are sent on a rescue mission.

Meanwhile, light years away, intelligence officer Ashton Childe is tasked with locating the poet, Ona Sudak, who was aboard the missing spaceship. What Childe doesn't know is that Sudak is not the person she appears to be. A straightforward rescue turns into something far more dangerous, as Trouble Dog, Konstanz and Childe find themselves at the centre of a conflict that could engulf the entire galaxy. If she is to save her crew, Trouble Dog is going to have to remember how to fight...

The former warship Trouble Dog and her crew of misfits is called upon by the House of Reclamation to investigate a distress call from the human starship the Lucy's Ghost. Her crew abandon their crippled ship and seek refuge abroad an abandoned, slower-than-light generation ship launched ten thousand years before by an alien race. However, the enormous ship contains deadly secrets of its own.

Recovered war criminal, Ona Sudak, faces a firing squad for her actions in the Archipelago War. But, at the last moment, she is smuggled out of her high security prison. The Marble Armada has called for her to accompany its ships as observer and liaison, as it spreads itself across the human Generality, enforcing the peace at all costs. The alien ships will not tolerate resistance, and all dissenters are met with overwhelming and implacable force. Then her vessel intercepts messages from the House of Reclamation and decides the Trouble Dog has a capacity for violence which cannot be allowed to endure.

As the Trouble Dog and her crew fight to save the crew of the Lucy's Ghost, the ship finds herself caught between chaotic alien monsters on one side, and on the other, destruction at the hands of the Marble Armada.

Low on fuel and hunted by the Fleet of Knives, the sentient warship Trouble Dog follows a series of clues that lead her to the Intrusion -- an area of space where reality itself becomes unstable. But with human civilisation crumbling, what difference can one battered old ship have against an invincible armada?

Meanwhile, Cordelia Pa and her step-brother eke out their existence salvaging artefacts from an alien city. But when Cordelia starts hearing the city's song in her head, strange things start happening around her. What extraordinary affinity does she have for this abandoned technology, and how can it possibly help the Trouble Dog?