Lieutenant Jacqueline Jack' Daniels, insomniac Chicago cop with a personal life more closely resembling a train wreck than a human endeavour, has trouble on her hands - not just because her boyfriend, Latham, wants to get married. A man in disguise has been visiting restaurants, grocery stores and fast food places, ingeniously spreading a deadly toxin. China Town's newest criminal calls himself The Chemist and he has murder on his mind. Add to that her dead father who isn't dead, her I-want-a-transfer partner and a plot to kill every cop in the windy city - a bad day for JD!'