Wiktionary
a. That which tell all; reveal everything, particularly what is normally withheld. n. A publication, usually a book or magazine article, which tell all; reveal everything, particularly what is normally withheld.
Wikipedia
Tell-All is a novel by Chuck Palahniuk, released on May 4, 2010. It is his 11th novel. A preview video, with the tagline: "Boy Meets Girl. Boy Gets Girl. Boy Kills Girl?" was released to entice fans prior to the novel's release. The paperback was released on May 31, 2011, with the cover by Rodrigo Corral Design, featuring illustration by Eric Danner.
Usage examples of "tell-all".
It re-ceived calls, almost all from Adam Norwitz, to inform Susan of offers for the rights to tell-all cable network dramatizations of her life.
He gave up visiting war zones and began to write, instead, lucrative profiles of the super-powerful, super-famous, and super-rich for their weekly and monthly magazines of choice: chronicling their loves, their deals, their wild children, their personal tragedies, their tell-all maids, their murders, their surgeries, their good works, their evil secrets, their games, their feuds, their sexual practices, their meanness, their generÂosity, their groomers, their walkers, their cars.
There were the usual art books, biographies, and tell-alls of the Famous for Fifteen Minutes.