Dark Knight star Aaron Eckhart and Oscar nominee Richard Jenkins join Johnny Depp in “Rum Diary” Dark Knight star Aaron Eckhart and Oscar nominee Richard Jenkins have joined the cast of “Rum Diary” – the upcoming adaptation of the Hunter S. Thompson novel that stars Johnny Depp. Eckhart is in negotiations while Jenkins is signed on for the movie, which Bruce Robinson adapted and is directing. Amber Heard also is on board. Eckhart is part of a love triangle that sees him vying with Depp for Heard’s affection. “Diary” is the tale of a washed-up, hard-drinking journalist named Paul Kemp (Depp) in 1950s Puerto Rico. Eckhart would play Sanderson, a wealthy landowner who believes everything has a price and introduces Kemp to a different standard of living. Jenkins is playing Lotterman, the man who oversees the rundown newspaper where Kemp works. The project, which Depp, Christi Dembrowski and Graham King are producing, begins shooting March 30 in Puerto Rico.