My guest this week is Irvine Welsh – who, three decades after his era-defining hit Trainspotting, returns with a direct sequel, Men In Love. Irvine tells me what Sick Boy, Renton, Spud and Begbie mean to him, why his new book hopes to encourage a new generation to discover Romantic verse and shagging, and why MDMA deserves more credit for the Good Friday Agreement than Tony Blair.

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My guest this week is the writer M. John Harrison, who joins me to talk about the rerelease of his 1992 novel The Course of the Heart – a deeply strange and riddling story of grief, friendship, memory and occult magic. We talk about why this book is so personal to him, what he learned from Charles Williams and Arthur Machen, turning his back on science fiction/fantasy and returning to it – as well as how probably the most acclaimed of all his novels, Light, came about after Iain Banks told him he wasn't having enough fun.

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Sam Leith's guest in this week’s Book Club podcast is one of the most popular living thriller writers. Karin Slaughter has made her native Georgia her fictional territory, and she joins Sam as she launches a new series set in a whole new county, with the book We Are All Guilty Here. They talk 'planning versus pantsing', what it means to write violence against women as a woman and how becoming the showrunner for television compares to the sovereignty of the novelist.

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My guest on this week’s Book Club podcast is science writer Carl Zimmer, whose new book Air-Borne: The Hidden History of the Life We Breathe explores the invisible world of the aerobiome – the trillions of microbes and particles we inhale every day. He tells me how Louis Pasteur's glacier experiments kicked off a forgotten scientific journey; how Cold War fears turned airborne research into a bioweapons race; and why the COVID-19 pandemic exposed a century-long misunderstanding about how diseases spread through the air.

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My guest on this week’s Book Club podcast is the historian William Dalrymple, whose bestselling account of ancient India’s cultural and economic influence, The Golden Road, is newly out in paperback. He tells me why the ‘Silk Road’ is a myth, how Arabic numerals are really Indian – and how he responds to being Narendra Modi’s new favourite author.

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In this week’s Book Club podcast I am joined by Lucy Mangan, author of Bookish: How Reading Shapes Our Lives. She tells me what teenagers did before they had Young Adult books to read, the bizarre demise of the author of Goodnight Moon, and the wisdom of forsaking the busy world for an armchair and a good book.

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My guest on this week’s Book Club podcast is the historian Alice Loxton, whose new book Eighteen: A History of Britain in 18 Young Lives is just out in paperback. In it, she tells the story of the early lives of individuals as disparate as the Venerable Bede and Vivienne Westwood. On the podcast, Alice tells me about Geoffrey Chaucer’s racy past, what Bede was like before he was venerable, and why her editor wouldn’t let her take her characters to Pizza Express. She also reassures me that – in a post-Rest is History world, where history is more exciting and accessible than ever – there is still a place for the fusty old historians.

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Sam Leith's guest on this week’s Book Club podcast is Robert Macfarlane. In his new book Is A River Alive? he travels from the cloud forests of Ecuador to the pollution-choked rivers of Chennai and the threatened waterways of eastern Canada. He tells Sam what he learned along the journey – and why we need to reconceptualise our relationship with the natural world.

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