Excerpts from former FBI Director James Comey's long-awaited book, "A Higher Loyalty," which releases next week, flowed like raging river rapids this week.

The excerpts brought light to many of the most anticipated parts of Comey's book, which details intimate conversations with the Trump administration, and President Donald Trump himself, in the weeks preceding his termination last May. Indeed, Comey's book is heavy with detail and exposes many of the country's most controversial issues over the last year and a half.

But a CNN correspondent, who said she spoke with several "high-ranking" FBI sources, said FBI agents are not thrilled with Comey's upcoming blockbuster.

What are the details?

Jamie Gangel said on CNN host Wolf Blitzer's show that her FBI sources are "not happy" with Comey's book, which they reportedly say crosses the line of professionalism Comey once held the bureau to.

She explained they believe Comey's book will bring more criticism to an organization already "under attack" from 1600 Pennsylvania Avenue.

"I've talked to quite a few former FBI high ranking sources, they are not happy about this because they feel it crosses the line of professionalism," Gangel said. "They are worried about their reputation. They have been under attack, the organization has been under attack."

She added her sources are "afraid" Comey's book will further damage the bureau's reputation in the long term.

What else?

While Comey's book is sure to become an instant best-seller and likely remain on best-seller lists for months to come, a parody back-cover of Comey's book circulaed on social media this week that perfectly embodied the mixed reactions Comey invokes.

Indeed, he has become quite the controversial man over the last year.