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The Pacific Signal Series -4- Deep Cover: A covert operator fights a threat from within.
Paperback
Series: The Pacific Signal, Book 4
Publisher: Independently Published
Published: Jun 1 2026
Pages: 232
Weight: 0.63
Height: 0.58 Width: 6.00 Depth: 9.00
Language: English
Bill Rathburne is dead. But the last question he asked may be the most dangerous one of all.
Six months after Singapore, Jesse Rathburne is still learning how to live without the man who stood beside her for decades. Sean and Emma are trying to understand the father they lost. And Sarah Keegan has returned to the quiet machinery of intelligence work, where some secrets are supposed to remain buried.
Then an anomaly appears.
A passenger aircraft vanishes from the systems tracking it, yet the aircraft itself is exactly where it should be.
What begins as a technical impossibility leads Jesse and Sarah towards Continuity, a forgotten Five Eyes programme built around an unsettling question:
What happens when governments can no longer trust the systems telling them what is real?
Bill had encountered it before.
He left clues.
And somebody has spent years making sure no one understands what they mean.
As Australia and New Zealand become the centre of a widening intelligence crisis, Jesse follows the trail Bill left behind through classified exercises, hidden records and a secret concealed much closer to home.
Along the way, Sean and Emma begin to understand that their father's greatest legacy was not what he knew.
It was how he taught them to think.
The Fifth Line is Book Four of The Pacific Signal Series, a tense geopolitical thriller about family, legacy, deception and the terrifying consequences of trusting the wrong thing.
Because when every system agrees, the most important question may be the one nobody thought to ask.
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