There are some places the human heart just doesn't want to go, and a four-hour documentary about children with cancer is one of them. But there are also experiences that leave a viewer with a profoundly enriched awareness of life's fragility and our own unexpected strength, and ``A Lion in the House" is one of those, too. A heart - render and a hankie-drencher, it's a film of quiet, almost incalculable power.
Screening in two parts at the Brattle today and tomorrow -- it also airs as part of PBS's ``Independent Lens" series June 18-19 -- ``Lion" is the product of eight years of work by filmmakers Steven Bognar and Julia Reichert, who were approached in 1997 by Dr. Robert Arceci, then head of the oncology department at Cincinnati's Children's Hospital Medical Center. Unknown to the doctor, the married documentarians had just come through their own cancer scare with their young daughter; not surprisingly, the directorial sensitivities are spread pretty evenly around.