Zero Gravity Films has set up indie thriller “I Will Follow You Into the Dark” with Castlight Pictures on board to finance and Mischa Barton set to star.Leah Pipes, Ryan Eggold and Jaz Martin are also attached with Mark Robinson set to helm from a script he penned about a girl who’s severely depressed after the deaths of both her parents. Convinced that the afterlife is mere oblivion, she retreats within herself, only to be drawn out of her depressive funk by an unexpected romance. When her new love disappears, she pursues him — even if it means walking across the threshold into death. Christine Holder, Mark Holder and Danny Roth are producing. David C. Robinson and Mark Darling are exec producing. Barton is repped by Domain Talent.