The book currently near the top of Amazon's Movers and Shakers list is one you may not have heard about — and we hadn't either, until today.

The surprise title is The Most Dangerous Animal of All, which had been kept under wraps by publisher HarperCollins until today's release date. Author Gary L. Stewart, writing with co-author Susan Mustafa, asserts that a search for his biological father led to a disturbing conclusion: Stewart's father was the notorious Zodiac Killer, who murdered at least seven people in an unsolved crime spree in Northern California in the 1960s and 1970s. The killer's murderous rampage inspired the 2007 David Fincher film Zodiac, as well as several documentaries. While many suspects have been mentioned, no conclusive proof of the killer's identity has ever emerged.

A HarperCollins spokesperson told New York magazine that the book had been vetted by company lawyers who concluded it was "legally sound." The company says Stewart, who was adopted and now lives in Baton Rouge, began his search for his father at the age of 39 after his birth mother contacted him for the first time.

Expect much controversy in the coming weeks as experts on the mysterious case debate the merits of Stewart's evidence.

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