Leo, a convicted felon, took the blame for stabbing his stepfather to protect his underage sister and was sent to Blackstone Prison. There, he encounters the prison's attending physician, Adrian. Leo mistakenly believes that Adrian has designs on his female lawyer and ex-girlfriend, Natalie, and treats him with open hostility. In reality, from the very beginning, Adrian has harbored an intense possessiveness and deep infatuation for Leo himself, secretly filling sketchbooks with drawings of him. Using his authority, Adrian forcibly binds Leo to the infirmary, locking him by his side under the guise of "medical custody." As they clash, Leo gradually discovers that Adrian's protection is not feigned, while Adrian constantly tests the boundaries between control and restraint. Amidst crises involving his sister, a prison riot, and the emergence of evidence to overturn his case, the two evolve from sworn enemies into ones who entrust themselves entirely to each other. In theend, Leo is exonerated and released; Adrian waits for him outside the prison gates to take him home.