The Secret of the Deepwater Portal by Harley Blue

Willabrook is finally calm again.

The clocktower ticks. The river flows. The town feels safe.

Until the river drains.

When a massive glowing hole opens in the riverbed, Alex, Jess, and Sam discover something far older than time glitches or broken inventions — an entire buried city hidden beneath Willabrook.

But the ancient Undercity is waking up.

A towering stone guardian rises. A terrifying Sentinel stalks the tunnels. And when Alex is pulled into the depths by a mysterious spiral key, Jess and Sam must follow him into a world powered by memories themselves.

Deep underground, they uncover the truth about the city's collapse — and the dangerous power hidden at its Core.

If they can't stabilise it, the river won't just flood…

The Secret of the Deepwater Portal is a thrilling underground adventure about courage, friendship, and the power of remembering who you are — even when the world beneath your feet begins to wake.