The Forbidden Stars — Tim Pratt

This “witty, heartfelt sci-fi romp” is the dazzling third installment in a diverse space opera series for fans of The Expanse and John Scalzi's The Collapsing Empire -- from a Hugo Award�"winning author (Tor.com)

The ancient alien gods are waking up -- and there's only one spaceship crew ready to stop them . . .

Aliens known as the Liars gave humanity access to the stars through twenty-nine wormholes. They didn't mention that other aliens, the ancient, tyrannical -- but thankfully sleeping -- Axiom occupied all the other systems. When the twenty-ninth fell silent, humanity chalked it up to radical separatists and moved on. But now, on board the White Raven, Captain Callie and her crew of Axiom-hunters receive word that the twenty-ninth colony may have met a very different fate.
 
With their bridge generator, they skip past the wormhole -- and discover another Axiom project, fully awake, and poised to pour through the wormhole gate into all the worlds of humanity . . .