Light the Abyss Books in Order

Light the Abyss is a young adult science fiction duology set in a future Britain that now lies underwater. Sea creatures move through the ruins of London, people travel by submersible, and everyday life carries on beneath the sea with a mix of routine, fear, and strict control. At the center of the story is Leyla McQueen, a teenage racer whose first goal is personal and urgent, to get her father back.

In The Light at the Bottom of the World, Leyla believes winning London's famous submersible marathon might give her the leverage to free him from prison. Instead, the race pushes her out beyond the safety of the city and into a much larger mystery. What begins as a rescue mission turns into a fight to understand what her government is hiding, who benefits from public fear, and what kind of world has been built in the dark.

Leyla does not stay sheltered.

Across the two books, her path keeps crossing with people who test, support, or complicate her choices, including her friends Theo and Tabby, the guarded Ari, and the family ties that drive so much of her courage. Those relationships give the series warmth in the middle of all the tension. The books remember that big political stories are also private ones. Leyla is not chasing truth for abstract reasons. She is trying to protect the people she loves.

The setting does a lot of work here. This is not a generic dystopian world with a little water splashed on top. Shah uses submerged Britain, and especially drowned London, to build a place of layered habitats, dangerous open water, ruined landmarks, and communities taught to fear what lies beyond their borders. The ocean can feel beautiful one moment and deeply menacing the next. That balance gives the series its tone, part adventure, part mystery, part political coming-of-age story.

Journey to the Heart of the Abyss raises the stakes without losing the emotional core. Leyla has already seen enough to doubt the official version of her world, and the fallout from her actions reaches far beyond her own family. Public tension grows. Old lies harden into prejudice. Travel becomes more dangerous, and the questions get bigger, touching on identity, propaganda, power, and who gets labeled a threat. The sequel keeps the pace moving, but it also lets Leyla grow into someone sharper and more self-aware.

What ties the duology together is Leyla's refusal to stop asking questions. Light the Abyss is fast-moving and full of peril, but it is also interested in hope, loyalty, and the cost of looking clearly at the world you were handed. If you like immersive YA science fiction with a strong sense of place, family stakes, and a heroine who grows braver without turning hard, this series has a lot to offer.