Ryn fights to maintain leadership of the pack when the other mermaids question her loyalties. Ben interferes in a mermaid ritual causing friction between himself and Ryn, meanwhile, Helen discovers more about her family lineage.
Warner and Eli worry about their dads´ health, so the four guys visit the doctor to get physicals. However, when the doctor dies before giving Warner his test results, he begins to question his own mortality.
While Red argues in court to uphold the validity of his immunity agreement, Liz and the Task Force question a man whose recent inheritance seems too good to be true and Dembe offers Red some advice.
When guards at a Virginia prison intercept a package with evidence relating to the kidnapping of two boys several years ago, the BAU questions a notorious serial killer who may have information on the boys´ whereabouts.
Louis flies the entire family to Taiwan in an effort to make things right with Gene. Upon meeting Gene´s beautiful fiancé, Margaret, and seeing the wonderful life he has built for himself, Louis questions whether his life in Orlando is just as great as it could be in Taiwan. Meanwhile, Jessica takes Eddie, Emery and Evan to her favorite childhood locales, including Dihua Street and Shilin Night Market.
Rosie makes a big decision after Spence starts asking questions about Ernesto´s behavior.Zoila learns a disturbing truth about Dr. Neff and tries to warn Genevieve.Jesse clashes with Marisol over her suspicions about Olivia.Evelyn puts Carmen in charge of disciplining her foster son.