This work investigates the structural integrity of the Old English epic poem Beowulf while challenging prevailing modern interpretations of its composition. Kenneth Sisam, a distinguished scholar of Old English, utilizes his deep expertise in philology and manuscript history to analyze the poem's internal organization. He presents a rigorous argument that questions certain critical assumptions regarding the poem's unity and the influence of later Christian interpolations on the original text.

Scholars frequently cite this text as a significant contribution to the study of Old English literature due to Sisam's meticulous attention to textual evidence. It is widely regarded as a foundational, albeit dense, resource for those seeking a more traditional and philologically grounded understanding of the Beowulf manuscript.