The book discusses the al-Hazmi/al-Mihdhar sharing failures in a section entitled "unanswered questions." To date nobody in the US government has credibly explained such bizarre conduct by Alec Station and the FBI UBLU. 9/11 Commission MFR's are still being withheld by these agencies. At least the agencies are consistent in their pattern of withholding information.
From the book:
The job of finding Mihdhar, nevertheless, went to an intelligence agent, Robert Fuller, working on his own. Corsi marked the assignment "Routine" because--she would later tell investigators--she "assigned no particular urgency to the matter." The designation "Routine" gave Fuller thirty days to get under way. It was August 29.
pg. 335
Routine? Al-Hazmi and al-Mihdhar were linked to the US embassy bombings in Kenya and Tanzania in addition to the Cole attack.
Corsi is the same person who falsely claimed the wall prevented the criminal side agents from being involved in the investigation. One should note that the US media has never interviewed any Alec Station and UBLU agents about the al-Hazmi/al-Mihdhar issues. Evidently deference to government secrecy is more important than getting answers as to why al Qaeda operatives were able to freely wander around the US in preparation for 9/11.