Viggo Mortensenis making his directorial debut with a deeply personal story about memory.

In a PEOPLE exclusive first look at the trailer forFalling, Mortensen stars as John, who takes in his conservative father, Willis, after he’s diagnosed with dementia. Their complex relationship takes a turn as Willis' views on life clash with John’s partner, Eric, and their adopted daughter, Mónica.

Mortensen, 62, tells PEOPLE the story is close to his heart after seeing his mother suffering from dementia “for several years” before her death in 2015.

Viggo Mortensen Falling

“We unconsciously edit and try to control our pasts in order to feel at ease in the present, whether we end up suffering from dementia or not,” says Mortensen.

The Oscar-nominated actor says he tapped into 40 years of acting experience to direct the film, saying, “Experience has taught me that a good idea can come from anyone at any time.”

Viggo Mortensen Falling

Brendan Adam-Zwelling

Viggo Mortensen Falling

“Happily, they brought a lot, and invested themselves personally and with great honesty in the story we were telling,” says Mortensen.

TheLord of the Ringsstar says he had attempted to direct a film for almost 25 years beforeFallingcame along, saying opportunities had never panned out after he wasn’t “able to raise sufficient financing to start shooting.”

“MakingFallingwas every bit as difficult as I imagined it would be,” he says. “But even more rewarding that I’d dreamed it could be. I can’t wait to tell another movie story.”

Fallingis in theaters, on digital and On Demand on Feb. 5.

source: people.com