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There are 43 tidal islands around the UK, accessible just briefly each day, along beguiling and perilous paths.

As the tide retreats, five writers walk their favourite causeway to islands of refuge, pilgrimage, magic and glamour.

Patrick Gale joins those seemingly walking on water as they cross to St Michael\\u2019s Mount in this first episode. Between kite surfers and dog walkers, he is suspended between two worlds as he follows the S shaped causeway, shaped by relentless tides and currents. He is joined by Lord St Leven who tells him about the near impossible task of maintaining the route to the Mount, his family\\u2019s home since the 17th century. And from the tidal walk emerge the stories and myths that have built up around Karrek Loos yn Koos, first visited by Archangel Michael, and now by hundreds of thousands of tourists.

Across the series: \\nEvie Wyld retraces a childhood walk across the Freshwater Causeway on the Isle of Wight, finding graveyards and ghost benches.\\nClaire McGowan sees time change as she enters the freezing waters off Burgh Island and sips cocktails in the art deco hotel bar.\\nBen Cottam almost gets stuck in the mud as he searches for the grave of a black slave and questions his family\\u2019s past at Sunderland Point.\\nAnd WN Herbert follows in the footsteps of pilgrims to Lindisfarne.

As sea levels rise and the sands shift, causeways are in flux. The Essayists draw us down onto the sands, revealing what these liminal routes mean to both them and the cultural history of the UK.

Producer: Sarah Bowen