Mac and Aiden investigate the murder of up and coming hip-hop artist DJ Banner, who was stabbed to death outside of a nightclub shortly before being crowned winner of a DJ contest. A threatening message on Banner's cell phone is traced to hip-hop mogul, Kevin Vick, who signed Banner to his label three days before the competition. Kevin denies killing Banner but 3-day-old bruises around Banner's ankles and hesitation marks in his signature suggest Kevin hung Banner over a balcony until he signed a contract. Mac finds a strip of paper from a copy of the contract on the fire escape outside of nightclub owner Jayden Prince's office, and Aiden discovers a bloody shirt in Jayden's toilet tank. A tool mark on Banner's rib bone is traced to a steel construction file and a sub dermal photograph of Jayden's hands reveals thin bruise lines from the construction file. Jayden confesses chasing Banner down the fire escape and stabbing him with the construction file, after learning Banner wasn't going to resign with him. However, Mac informs Jayden that Banner was forced to sign with Kevin, and only waited to tell Jayden because he didn't want to destroy their friendship and promising career together. Stella and Danny investigate the drowning death of elite fashion designer, Deborah Gayle, who was found in her penthouse pool. Toxicology reports reveal Deborah ingested blowfish poisoning, and red nail polish behind her teeth containing the blowfish poison is traced to naked "female table" sushi restaurant model/employee, Mitchiko Muzawi, one of Deborah's former models. Deborah fired Mitchiko for being overweight, and Mitchiko, tired of Deborah's demeaning behavior, mixed blowfish poison in her toenail polish, knowing Deborah had exotic fetishes and would eat sushi off of her toes.