When Claire Hart visits her son Charles and daughter-in-law Wendy's home, she's unexpectedly humiliated by Vivian, the arrogant mistress, who mistakes her for Wendy and demands her to end the marriage. Masking her anger, Claire uncovers Charles's betrayal and financial support for Vivian. Furious, she sends Wendy away and vows to take down them both. Will her plan save the family—or tear it apart?