'When the Mountain Calls: Nepal, Tibet, Bhutan,' features Emmy-winning filmmaker Tom Vendetti's experiences and reflections drawn from his more than 30 years of traveling through the Himalayas. Archival video and photographs, along with diary entries, chronicle the changes Vendetti observed over the decades as Chinese and Western influence increased, climate change altered the landscape and the culture faced the threats of modernization. The film features Vendetti's past interviews with the Dalai Lama, Lama Tenzin, Grammy-winning flutist Paul Horn, Sherpa Tenzing Norgay and Sir Edmund Hillary (who together summited Mt. Everest in 1953), the Prime Minister of Bhutan, and a representative from Greenpeace China. Musician and actor Kris Kristofferson delivers the on-camera prologue and epilogue.