I have to agree with the readers who said this book was full of good information but oddly dull.
For one thing I got completely lost in the names of the Native tribes and people who interacted with settlers at Roanoke or some about them in later years. Perhaps there might have been a way to anticipate this and mitigate it.
For another, I dislike books that constantly begin sentences with "as mentioned earlier." Seems like this should not be necessary as item as it was done here.
Having made those gripes, I think Fullam's theories make a lot of sense, and he has spent a lot of time reading primary sources as well as modern historians. It does seem likely that the 1587 settlers moved to the mainland in the area he suggests. Whether or not they in fact sent a ship to Newfoundland to look for British vessels, the hurricane in 1589 would have done in most of whoever was left. His overview of local Native legends about white ancestors was interesting and it is plausible that a small number of survivors of the hurricane would have integrated into a friendly Native tribe.
I was expecting information about archaeological explorations like in the Jamestown book I read some time ago, but that is not what is going on here.