It seems extremely odd and immensely foolish for Dershowitz to let his name be used or associates with mueller in any way whatsoever. And Dershowitz is much smarter than that. Much much smarter! I therefore suspect this amazon listing is some kind of a fake.
Foreword, not forward.
It appears that there are several versions of it coming out. This one. Washington Post. This one looks fun: The Mueller Meme Report: Winners Aren’t Losers - A Coloring Book Meme Guide To All The Russian Collusion Found After 657 Days Of Investigating
But they did the same thing with the 911 Commission Report, even though you could download it free.