ob·ses·sion
əbˈseSHən/
noun
the state of being obsessed with someone or something.
"she cared for him with a devotion bordering on obsession"
an idea or thought that continually preoccupies or intrudes on a person's mind.
A story told from the perspective of two separate women. A story of how one becomes obsessed with the other, but maybe not for the reasons one might think.