heroine, heroin

Heroine or heroine means the female protagonist or main character of a story, movie, or book--
The heroine of romance novels is often a young governess who marries the lord of the manor.
She dreamed of being the heroine of every romance novel she ever read.
A heroine may also be a female who does a brave deed--
The real-life heroine saved two children from a burning building.

Heroin or heroin ( rhymes with heroine ) means the illegal narcotic related to opium and morphine--
The criminal in police shows is often a heroin addict.
He is an in-patient at a hospital, being treated for heroin addiction.

Now that you know that, you can say--
"The heroine of this news story risked her own safety to have a heroin pusher arrested."