Guardian columnist Michele Hanson demonstrates her love of 18th-century literature by selecting Tobias Smollett's novel The Expedition of Humphry Clinker as her favourite paperback. Science Museum Group executive Roger Highfield selects Siddartha Mukherjee cancer biography The Emperor of All Maladies, while Harriett Gilbert chooses A Murder of Quality, John le Carre's second novel featuring fictional spy George Smiley