Crossover with Medical Investigation
Two guys rob a jewelry store and kill the proprietor. The guy who fired the lethal shot gets away, but his partner, who is AWOL from the Army and was recently stationed overseas, is caught and hospitalized with a strange illness. Dr. Hickman is so worried, she calls in Dr. Connor and Durant from the NIH, who identify the patient as having a rare and dangerous viral infection. There is another patient at Beth Israel who has it, and Carlos, who has just had a happy reunion with Holly, has been exposed and collapses with a high fever after vomiting. Sully continues to encourage Monroe to tell Ty about her pregnancy, but she wants a chance to work things out on her own with Ty before telling him about the baby. As Cruz and Santiago take Maddox to central booking, he is shot in the police station by a young boy. When a man named Marcel Hollis arrives with a lawyer to take care of the boy, Cruz finds out that Hollis was Maddox's second in charge, and is now taking over the 108 (Maddox's gang). Cruz can't find a way to arrest Hollis, so he remains free to brutaly get rid of his competition. Faith finds out that Bosco requalified, but he blows her off when she asks him how. Faith decides to do a little investigating.
Carlos and the gang behind the jewelry store robbery are hospitalized with what the NIH doctors figure out is a strain of Marburger's disease, a rare disease that causes its victims to bleed to death. Holly holds a vigil by Carlos's bedside (or, as close as the doctors will let her get) while the other patients around him slowly bleed to death. The doctors collect more people who are dying or have already died from the disease. They are distracted by a red herring when they find out that a vial of Marburger is missing from a nearby lab in New Jersey, but it turns out that it isn't the source of the infection. Faith and Dr. Connor work together to figure out that the members of the jewelry heist gang are also smugglers, and when they find the smugglers' boat, they find an African monkey who has died from Marburger - the source. Carlos makes a miraculous recovery and has another happy reunion with Holly, who never got infected herself.