Plot summary
Dean, Isabelle, and Pam host an intervention for Celia. Silas serves as a babysitter for Rad while Lisa and her ex-husband have a custody hearing. Silas accepts that they will never have a serious relationship. Shane loses his virginity by having a threesome with Harmony and Simone. Andy finds Maria in Mexico. When Andy brings her across the border, the militia leader finds them and expels Doug from the ranks. Nancy hires Clinique and Sanjay to replace Celia in the maternity store. Nancy discovers that Guillermo is trafficking women through the tunnel, and starts having a series of migraine headaches. Esteban and Nancy take ayahuasca, a brew with powerful psychedelic effects to help Nancy "unwind the knot in her soul." During her high, Nancy imagines one of the women she saw being smuggled standing in the Pacific Ocean.
Credits
Adapted from Wikipedia contributors, Weeds season 4. Exact episode table narrative; paragraph formatting adjusted; reference markers, illustrations, cast notes and title-reference commentary omitted.