Agatha, a bristly painter fleeing her own darkness, decamps to rural New Mexico to live the reclusive life of a small-town curmudgeon. It is there she meets Alice, a mild widow with a deepening case of dementia who keeps steady vigil at her daughter's backyard grave. Despite Agatha's rough edges and fierce aversion to sentimentality, she surprises herself by falling in love, and her well-worn convictions begin to upend. As Alice's condition worsens, Agatha hatches a plan for them to live together at her remote residence at Mesa Portales. But when Alice's wayward son comes along with different ideas--and Alice suddenly goes missing--Agatha takes matters into her own hands with the help of a faithful thirteen-year-old-neighbor, a pair of shovels, and her trusty pickup, embarking on an unusual mission that calls into question whether some secrets are better kept buried. Sharp, watchful, at once thrillingly perceptive and hidden from herself, Agatha is as imposing as the vast landscape her rustic adobe home overlooks. Loosely inspired by the life of Agnes Martin, I Am Agatha introduces us to this irascible, indelible character who learns--over a stretch of strange, singular days--new ways to fathom life, death, and her own heart.