There are 2 books in the Light the Abyss series. The newest book is Journey to the Heart of the Abyss which came out in 2021.

1
The Light at the Bottom of the World

Book cover of The Light at the Bottom of the World

From debut author London Shah, comes a thrilling futuristic Sci-Fi mystery perfect for fans of Illuminae and These Broken Stars.

In the last days of the twenty-first century, sea creatures swim through the ruins of London. Trapped in the abyss, humankind wavers between hope and fear of what lurks in…

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2
Journey to the Heart of the Abyss

Book cover of Journey to the Heart of the Abyss

Leyla has reunited with her father and rescued him from Broadmoor, the illegal government prison that held him captive--but not without a terrible cost. Now labeled as one of Britains most wanted terrorists, and separated from the boy she cares for, Leyla and her father must risk undocumented travel through…