The Tide Knot
In a seaside town of sandy beaches and ocean breezes, Sapphy has never felt so far from the sea. The crowded shore at St. Pirans is nothing like the cove at Sapphy's old home, where she first found her way into the underwater world of Ingo.
I can't go back in the house. I'm restless, prickling all over. The wind hits me like slaps from huge invisible hands. But it's not the wind that worries me. It's something else, beyond the storm...
Ingo's pull is strong, and it always finds a way. Soon Sapphy and her brother, Conor, are swimming beneath the waves again, riding the currents and teasing their Mer friend Faro. As Sapphy goes deeper into Ingo, she learns to feel more at home in the sea — even as she begins to be aware of its dangers.
There's the danger of going in too deep, and breaking the delicate balance between Sapphy's life on land and her life in Ingo. There's the mysterious disappearance of Sapphy's father, an experienced sailor who should never have drowned. And then there's Ingo itself — a restless power as old as the world, as strong as the tides, and more dangerous than anything Sapphy has ever known.
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Helen Dunmore
Helen Dunmore FRSL (1952-2017) was a British poet, novelist and children's writer.
Dunmore was born in Beverley, Yorkshire, in 1952, the second of four children of Betty (née Smith) and Maurice Dunmore. She studied English at York University, and lived in Finland for two years (1973–75) and worked as a teacher. She lived after that in Bristol. Dunmore was a Fellow of the Royal Society of Literature (FRSL). Some of Dunmore's children's books are included in reading schemes for use in schools.
In 2017, she published her last book, Birdcage Walk, before writing an article about mortality for The Guardian after she was diagnosed with terminal cancer. Her death was announced on 5 June 2017.
Ingo
Ingo consists of five books. The current recommended reading order for the series is provided below.

