This book falls short in providing essential proof.
For the theory that WS is not the author to be considered true, four people must be proven to be liars. Each of them knew Shakespeare personally and professionally, and each put their names to works that give Shakespeare's name as the author.
They are: John Heminges - Editor of the 1st folio; member of the same acting company as WS; mentioned in WS's will; and a shareholder in the Globe.
Henry Condell - like Heminges an editor of the 1st folio; member of the same acting company as WS; mentioned in WS's will; and a shareholder in the Globe.
Ben Jonson - Contributed introductory material to the 1st folio; mentioned WS to other writers who recorded the conversation; WS is listed as a cast member in a Jonson play.
Richard Field - Was the first publisher of WS's poetry; like WS he was born in Stratford Upon Avon and was the same age as Shakespeare; it is highly likely that they knew each other as boys and attended the same school.
All four of these people could not be mistaken or misled. They all worked with and knew Shakespeare personally, and by placing their names to works that give WS as the author they are either telling the truth or lying.
In history when four individuals, who definitely should know, make a claim then the weight of evidence is that the claim is true.
The alternative is a conspiracy. Conspiracies do happen but undiscovered conspiracies are rare and they require proof (not theories) before they can displace the documentary evidence.