There have been many famous partnerships in the world, from musical ones like Hall & Oates to business ones like Bill Gates and Paul Allen. But one of the more underrated partnerships is that between authors and editors, a relationship that can be mysterious for those not well versed in the process.

The new documentary Turn Every Page: The Adventures of Robert Caro and Robert Gottlieb, takes deep dive into the ineffable bond between Caro, author of The Power Broker and four (and counting) biographies of Lyndon B. Johnson, and Gottlieb, his longtime editor at publishing company Knopf. Caro is notorious for taking his time with his books, releasing only one about every 10 years since 1974.

The film, directed by filmmaker (and daughter of Robert) Lizzie Gottlieb, features a variety of “talking head” interviews from people as diverse as Conan O’Brien, The New Yorker editor David Remnick, and President Bill Clinton, but cedes the majority of its time to hearing from the two men themselves. Both have lived extraordinary lives, but – despite their strong connection – in very different ways.

It would be fair to call Caro “obsessive,” as his career has focused on hefty non-fiction tomes devoted to just two men. The Power Broker, a Pulitzer Prize-winning, 1,300+ page book about urban planner Robert Moses, goes into great detail about how Moses shaped the landscape of New York City, and not always for the better. He has also published four volumes of The Years of Lyndon Johnson, all detailing Johnson’s life before he was president. The yet-to-be-published fifth volume is highly anticipated, to say the least.

In addition to the books of Caro, Gottlieb has edited books by Joseph Heller (famously providing the title number for Catch-22), John Cheever, Toni Morrison, Salman Rushdie, Ray Bradbury, Michael Crichton, Bill Clinton, and many others. Astonishingly, he has also had time to write eight of his own books, serve as editor of The New Yorker, program both the New York City Ballet and Miami City Ballet, and more.

Lizzie Gottlieb gives each man plenty of space to tell their own story, with perhaps a slight bias toward her father. Caro is 87 and Gottlieb is 91, yet neither shows any significant mental decline. In fact, their ability to recall the many important moments of their lives and continue to ruminate at a high level is intimidating, and a testament to their intellectualism.

Among the many amazing stories that made the cut of the film are how Gottlieb had to get Caro to cut 350,000 words – or around 700 pages – from The Power Broker just for it to be small enough to be bound, and another about how Caro, in his extensive research about LBJ, discovered just how Johnson literally stole a primary election in his first run for the Senate.

The mark of any good documentary is its ability to engage viewers who may not be intimately familiar with its central subjects. While it’s the professional lives of Caro and Gottlieb that are most notable, the film includes just enough information about their personal lives to make them into full human beings, unlocking what for many have been mysterious figures.

Turn Every Page may be most interesting to those who have read and loved Caro’s books over the past five decades, but there’s enough there to open the film wide for the uninitiated. The lives of Caro and Gottlieb are large, and the documentary provides a great glimpse into how they became that way.

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Turn Every Page: The Adventures of Robert Caro and Robert Gottlieb is now playing in select theaters.

Photo by Martha Kaplan / courtesy of Wild Surmise Productions, LLC and Sony Pictures Classics

The young author and editor in Turn Every Page: The Adventures of Robert Caro and Robert Gottlieb.