It's Katrina Harts first day at firehouse 51. Hart Grew up alongside a family of first responders and that's why she grew up to be a paramedic. Katrina is the new PIC ( Paramedic In Charge) after Gabby Dawson left, Katrina already knew Kelly Severide and Stella Kid. Kelly and Katrina went to academy with each other but little does he know his old crush is going to show up and work alongside him. Katrina and Stella met at the first responders gala. Katrina Hart is played by Gabrielle Moses I kept Erin Lindsay in it as I really love her

Kaylani Morris is a firefighter at fire house 51 taking the spot of Peter Mills. Over the 3 months she's been there she quickly became best friends with Brian 'Otis' Zvonecek. Everyone at the house loves her but there is one other issue her and Otis both have feelings for each other so now they have that to deal with too. (Warnings: sexual themes and language)

Elizabeth Cardiner was a shy, nerdy girl throughout high school and dated Kelly Severide for a short period time. They broke up due to Elizabeth heading off to join the army, much to her brother, Benedict's dismay. Benedict is very hardworking and has a job high up in the CFD. Now, 25 years old, and having returned to Chicago, Eliza has a job as PIC at Firehouse 51, courtesy of her brother. Little does she know that Kelly severide works there as the lieutenant. Kelly thinks of Elizabeth as the same girl he was with back in college, but she's not that girl anymore, will sparks be reignited between the two?

After her near-death experience, Olivia Lewis decides to focus more on a future, a future that she can't have with Kelly Severide. Just when she is starting to regret her decision, Stella Kidd comes to Firehouse 51 and reignites her history with Kelly Severide. Olivia would be angry but she has her hands full with deciding whether to give her ex-fiancé, Jesse Harraway, a second chance. Will she actually become Mrs Jesse Harraway or will Kelly Severide finally realise what he wants? Who is her one and only? (Book 2)

Olivia Lewis, influenced by Kelly Severide's words, accepts Camille's offer of training to become the lieutenant of Squad 6. But will she be able to leave Firehouse 51 behind for good? Or will she always go back to him? (Book 4)

After the warehouse fire, everything seems to be going well for Olivia and Kelly. They have finally stopped avoiding that they are meant for each other, the perfect time for them to make up for the lost time. But their happy ending is short-lived when Olivia's past resurfaces with the sole purpose of jeopardising her new life. The dark truth about Jerry Lou emerges and Olivia finds herself becoming the prey, a victim of a cruel hunting season that's to come. True love is ruined by death and lies. Will Kelly Severide still love her when he realises she isn't as innocent as she seems? Will he still hold her bloodstained hands? Or is there only so much someone can take? (Book 3)

What's a girl from England doing in Chicago? Well, she's joining 51 as the new paramedic. But this girl catches Severides eyes. She's absolutely breath taking with her bright blue eyes and dark brown hair. Her first rescue is a success so to celebrate they all go out to Mollys. After a few drinks, she manages to spill some juicy details about her life to Kelly. What is going to happen when a forbidden romance gets approved by the Chief? Why is she getting special treatment? Where are her parents? Who is she? Athena Teresa This is her Life In Chicago. (WARNING: This book will contain tough subjects and may also include swearing, detailed sex and alcohol.) A Life In Chicago

My Name is Brooklyn Ziva and I was transferred to firehouse 51. Soon after getting there someone caught my eye but I couldn't get involved...

She didn't like her family so she left. She survived a few weeks before she ended up at the wrong place, at the wrong time. She's trying to run away from everything but she's subconsciously crying out for help even though she won't take it, will she?

Kelly's sister