This long-lost masterpiece of gay erotic cinema centers on a handsome young stud who rides his motorcycle through myriad sexual encounters - from a soccer game's locker room to a dreamy and unsettling orgy where the film reaches its melancholic peak. Newly scanned in 2K from the original camera negative and directed with absolute grace by the mysterious Dietrich de Velsa (also know as Francis Savel and Frantz Salieri). This former painter was also the owner and artistic director of one of the first queer cabarets of Paris, La Grande Eugene. Years later, he collaborated with Joseph Losey on Mr. Klein and Don Giovanni. Equation to an Unknown is his only film and stands without a doubt as a masterpiece - easily one of the best French gay adult films ever made.

This special edition includes Remembering the Equation, a video essay about the film by +Heart director Yann Gonzalez; Diary of a Fight, a short film narrated by Alain Delon featuring director Francis Savel (the real name of Dietrich da Velsa); the original 1980 film trailer; a brand-new theatrical trailer and more. The Blu-ray also includes a vintage Jean Daniel Cadinot centerfold poster featuring sexy lead actor Gianfranco Longhi!