Finishing up Carpenters Gothic

So as i finished Carpenters gothic, i found out that Liz is having sex with McCandles, Paul is having an affair with Liz's best friend, and Liz is found dead in the house. now i have a few questions and i kinda of answered but maybe i am wrong i dont know
1. why is Liz having an affair with McCandles?
2. Did McCandles kill Liz because she refused to leave with him because she was married?
3. what happens to the money now that Liz is dead?

so i kinda of made my own answers to this

1. I feel like Liz is only sleeping with McCandles because she just wants to satisfy her personal woman needs, becuase she is not getting that from Paul. Her relationship with Paul is al negative and all she wanted was to feel like a woman and she never got that with him and so felt that with McCandles but this ties into the next question as to why she doesnt want to leave with him

2. i felt that McCandles was the one to kill Liz because, she didn't want to leave and start a life with him and he got upset and that and so he probably took out his anger by doing something that he regrets

3. the money i felt that Adolph was never really going to give it to them in the first place, yes he gave them little by little but i feel like thats all they were going to get, and now that Liz is dead, he is going to keep all the money