Brookes POV in the events that follow Through the Ever Night. 
 Brooke is in charge of taking care of the Dwellers after they arrive despite her obvious lack of concern and hatred towards them. Especially her hatred towards Aria for taking all that was "hers" before she came along and ruined it for her. She's also being sent out to keep an eye out on the land from any intruders that may enter the camp site (I was wondering about this while reading Into the Still Blue!). It's her own story of growing and learning to be independent on her own without Perry.