This book is not only a solid addition to the corpus of Viking study, but it also fills in many gaps left by other scholars. Focusing on one dynasty has proven to be an effective approach to looking at what is otherwise a sometimes overwhelming topic. It also allows Downham to show just how connected the events in Ireland and the island of Britain were, something which seems to be neglected by far too many medieval scholars. For the most part Downham's conclusions seem safe and well explained, though occasionally she does fly in the face of obvious evidence. But her scholarship is modern and up to date, without being overly partisan, and her style of writing is very readable, without ever losing academic credibility. I'd recommend this book to anyone interested in things Viking but for those more interested in the British Isles, this is a must.