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Julia Lambert, an artist, is spending the summer in her old Maine farmhouse. During a visit from her elderly parents, she hopes to mend complicated relationships with her domineering father, a retired neurosurgeon, and her gentle mother, who is descending into the fog of Alzheimer's. But a shattering revelation intrudes: Julia's son, Jack, has spiraled into heroin addiction. In her attempts to save him, Julia marshals help from her loosely knit clan, but Jack's addiction courses through the family with a devastating energy, sweeping them all into a world of confusion, fear, and obsession.