Because all she needs to do is remember .
When a homicide case reunites Carrie with her ex-boyfriend and partner Al Burns , she decides to permanently join his unit despite her conflicted feelings and try to solve Rachel 's murder .
Because all Carrie needs to do is remember .
When a homicide case reunites Carrie with her ex-boyfriend and partner Al Burns , she decides to permanently join his unit despite her conflicted feelings and try to solve Rachel 's murder .