Chapter 1 - Undercover

Lexi Shay (Leslie Shay's twin sister), a Detective in the Intelligence Unit, deals with her sister's death, the end of her relationship with Severide and her budding relationship with her partner Halstead. What happens when she finds out she's the reason for her sisters death? How will she cope? How is an old case she worked involved? Jay/OC, Kelly/OC. Cameos of characters from Chicago PD and Chicago Fire. Note: Lindsey doesn't exist. Burgess is a Police Officer within the intelligence unit.