Lucy Worsley examines Agatha Christie's later life, and discovers how, amid the turbulent social and political change of the 1930s and 40s, newfound personal happiness ushered in a golden age for her writing.In 1930, recovering from a personal crisis, Agatha Christie fell in love with and married Max Mallowan. This relationship, and the security it brought, saw Agatha enter the most prolific and successful chapter of her career. This would be the period in which Agatha penned some of her most famous and enduring bestsellers, including Murder on the Orient Express.Lucy follows in Agatha's footsteps to discover the roots of these works and explores how, in later life, Agatha achieved global celebrity – but remained very much the anonymous observer, hiding in plain sight.