Here is a list of The Books of Babel Books in Order.
Senlin Ascends (2013)
From the blurb:
Mild-mannered headmaster, Thomas Senlin prefers his adventures to be safely contained within the pages of a book. So when he loses his new bride shortly after embarking on the honeymoon of their dreams, he is ill-prepared for the trouble that follows.…
Arm of the Sphinx (2015)
From the blurb:
Forced by necessity into a life of piracy, Senlin and his eclectic crew struggle to survive aboard their stolen airship as the hunt for his lost wife continues. But the Tower of Babel is proving to be as difficult to re-enter as it was to escape.…
The Hod King (2019)
From the blurb:
Thomas Senlin and his crew have been separated following the orders of the mysterious Sphinx. Meanwhile, the enslaved hods climb the Black Trail and whisper secrets in the dark. As Senlin and his crew are dragged ever further into the Tower’s conspiracies, everything falls to one question: who is the Hod King?
The Fall of Babel (2021)
From the blurb:
As Marat’s siege engine bores through the Tower, Senlin can do nothing but observe the mayhem from inside the belly of the beast. Edith and her crew are forced to face Marat on unequal footing, with Senlin caught in the crossfire, while Adam attempts to unravel the mystery of his fame inside the crowning ringdom. And when the Brick Layer’s true ambition is revealed, neither the Tower nor its inhabitants will ever be the same again.