Nicki Whitely

Before their parents got married to one another, 15-year-old Derek and 14-year-old Casey ruled their respective houses as the oldest sibling. Now they're in constant rivalry for top dog status of the five kids all living under one roof. The two teens will plot anything they can think of at school, with friends or other siblings to win these funny family battles.

After Hayes and Wallace share a passionate night together, Hayes cautiously considers sticking her toe into the relationship waters with Wallace. Hayes implores the CIU team to aggressively pursue the case of Sophie Hausen, a young woman serving a life sentence for murdering a popular college basketball player, whom she accused of raping her.

Now that Rosen has discovered the identity of the mole, he must face down the nearly impossible choice of what to do next. Meanwhile, the team takes on their individual family issues: Hicks' son Tyler comes for a surprise visit and John gets to meet Rachel's parents. And Kat gets her first case, tracking a mysterious new street drug that makes users temporarily invincible.