I'm feeling really spontaneous at the moment and I want to write a story.?

a person goes to the police (this person is A) and tells them someone murdered her sister(B) and they were twins and then then go and see the dead body and the house where they all live. A is asleep on the couch by the time the police get there and there is a dead bloddy body of B behind the couch. Then A doesnt remember anything at all not even her name. Then as the story goes on and the police are trying to get A's memory back they are looking at pictures in the atic and find out that they are triplets. so it was C that wnt to the police and then killed B and knocked out A. You can take it from here...im thinking B had a boyfriend who C really really likes but C is a little crazy and the boyfriend wont even do anything with her so C kills B and then knocks A out to fram her and punish her for not helping......and then for another twist....C is A!!! and the real A is dead so C killed them both and repored it to the poliec and pretended no to remember