Ep 9. Twisted Sister

The episode "Twisted Sister" of NCIS season 4 follows the team as they investigate the murder of a female Marine named Lance Corporal Lori Petrie. The team quickly discovers that there is a connection between Lori and her sister, Jenny, who is also serving in the Marines. Jenny initially fakes her own death in order to avoid suspicion, but the team eventually tracks her down and brings her in for questioning.

As the investigation progresses, the team learns that Jenny and Lori had a complicated relationship, with Lori possibly being involved in some illegal activities that Jenny was not aware of. The team also uncovers information about Lori's romantic relationship with a fellow Marine named Kody, which could have been a motive for the murder.

Gibbs, the team leader, goes undercover to infiltrate Lori's unit and gather information about her fellow Marines, while Ziva and Tony interview Lori and Jenny's family and friends to get a better understanding of their relationship. Meanwhile, Abby, the team's forensic specialist, analyzes evidence found at the crime scene and uncovers a possible suspect.

Throughout the episode, tensions run high between the NCIS team and the Marines, as they clash over jurisdiction and the Marines' reluctance to cooperate with the investigation. The team must navigate these challenges in order to solve the case and bring Lori's killer to justice.

The episode also explores the theme of sibling relationships, as the team delves into the complicated dynamic between Lori and Jenny. The episode raises questions about loyalty and betrayal, and the lengths that people will go to protect those they love.

Overall, "Twisted Sister" is a tense and intriguing episode of NCIS that keeps viewers on the edge of their seat as the team works to solve the case. With its complex characters and thought-provoking themes, it is a standout episode in the series.