Clues...

Honestly, I suspected Molly when her character was introduced. The main character lusted after her and not the woman his age? Fishy. Also, a big clue was when she moved out rather suddenly. I never really liked Molly, so I think that had something to do with my suspicion of her. However, my suspicion was solidified when she was kidnapped and fought off the Reaper. She was so small and weak and there was a bat just laying around? This is not Crime and Punishment, weapons don't just hang around... waiting.