Beowulf: The Monsters and the Critics give it a powerful effect. He rebuts suggestions that the poem is an epic or exciting narrative, likening it instead to a strong masonry structure built of blocks that fit together. He points out that the poem's theme is a serious one, mortality, and that the poem is in two parts: the first on Beowulf as a young man, defeating Grendel and his mother; the second on Beowulf in old age, going to his death fighting the dragon. The work has been praised by critics including the poet and "Beowulf" translator Seamus Heaney. Michael D. C. Drout called it the
Beowulf: The Monsters and the Critics 1936". Tolkien stated, for instance, that Beowulf was not an actual picture of Scandinavia around 500 AD, but was a self-consistent picture with the marks of design and thought. This might leave the reader wondering, commented Shippey, what exactly Tolkien meant by that. Shippey argued that there was evidence from the chronology given in the 2014 book, supported by the work of scholars such as Martin Rundkvist, that there was serious trouble among the eastern Geats, with migration and the taking over of mead-halls by new leaders, at that time, just as portrayed in the poem. Beowulf: The Monsters and