Mixed bag. I like that the Memory Man is a developing character who grows and changes through the series. But, as mentioned by other reviewers, it also takes a bit away from the uniqueness of who he is. Also as mentioned, this plot (actually these plots) are all over the place. There were some concerns about the accuracy of Baldacci's accounts of fracking. I don't know enough about that to say what was right and wrong. But I think I'll go by his own summary of the facts in the postscript: there is a military installation in North Dakota. There is fracking in North Dakota. I made up everything else.
Overall, 3/5. Some interesting plot twists, but the writing is weaker than I'm used to in this series.