Chicago P.D. is back for Season 10 on September 21. Here Tracy Spiridakos who plays Detective Hailey Upton breaks down what you need to know ahead of the highly anticipated premiere the first episode since Jesse Lee Soffers exit was announced.

Where We Left Off

In his efforts to bring in elusive drug kingpin Javier Escano (José Zúñiga) Sgt. Hank Voight (Jason Beghe) put confidential informant Annas (Carmela Zumbado) life in jeopardy. And in the dramas Season 9 finale Voight and Hailey discovered the dying Escano who with his last breath named Anna as his killer. Anna refused to go quietly and shot Voight prompting Hailey to fire back ultimately killing the CI.

Where We Pick Up

Season 10 starts about two weeks after the shooting and Voight and Upton havent really discussed whats happened Spiridakos says. That causes a world of tension between the pair. Hailey is worried about Voight and Voight is fixated on making Annas death mean something.

Coming Up for Hailey

The finales events also put a strain on Hailey and husband/fellow detective Jay Halstead (Soffer). Haileys worried about Jay Spiridakos says. Theyre both concerned for Voight but their approach to how to handle it is very different. Also Get set for a new chief!