Nemesis

nemesis
noun
/ˈnem.ə.sɪs/

Someone's nemesis is a person or thing that is very difficult for them to defeat.

(a cause of) punishment or defeat that is deserved and cannot be avoided
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Mara Coleman thinks she has seen it all. The ruthless world striking mercilessly every second of the day. Leaving all those who only want to do good in the world exhausted, defeated.

But things can always get worse when suddenly Mara sights an "altercation" that tragically ends in murder, a murder that is quickly covered up and soon forgotten.
Why, When, Who, or what inspired the tragic events is all Mara thinks about, and most importantly if she was seen by the killers at the time.

Killers straight connected to Harry Styles, an egomaniac with hints of sociopathy, who is ready to get rid of loose ends to clear out the police from his business.

"You'll have to run faster than that to escape from this, darling"