And the Walls Came Tumbling Down

Mac and Karen decide to let Greg be in Meg's life, but to wait awhile before telling her she's adopted. Victoria tells Mac that Pierce killed his last girlfriend and gives Gary numbers to Pierce's former business partners. Gary calls and only gets bad reports. Val is worried that the stress will cause Gary to drink, and he considers it, but goes to an AA meeting. Claudia has Greg get Joseph a job in Massachusetts. Joseph discovers a major flaw in his design, and realizes he'll have to start over from scratch. He refuses to tell Gary, and Kate is angry. Joseph gets the job offer, but doesn't tell Kate. Alex, Rosa's nephew, shows up at Claudia's. He says he knows her secret and will be staying with her for awhile. He comes on to her. Pierce becomes enraged that Joseph spent Christmas at Greg's and accuses him of giving Greg information. Pierce tries to choke Joseph, but Paige interrupts and stops Pierce.

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S13E13 - The Torrents of Winter