'A Key to Lord Tennyson's 'In Memoriam'' is an account of Alfred Gatty's pilgrimage to the places that inspired Alfred Tennyson's great work, which also helped him come to terms with the losses in his own life. The book is a mix of memoir, literary criticism, and travelog, as Gatty reflects on his life and the experiences that led him to this point. It includes detailed descriptions of Somersby, the birthplace of Tennyson and the setting of many of the poem's scenes, as well as Clevedon, where Tennyson's friend Arthur Hallam is buried. Gatty provides a unique perspective on the poem, drawing on his own memories of the people and places it portrays, and offering insights into its themes of loss, grief, and faith.