That night in Catherine's rented house...
Jerome was sitting on the chair, his eyes would occasionally roam around the house, trying to spot something that could potentially help him with his plan. He won't be able to break inside the house and have his way with Catherine because the house is very small and any tiny commotion will wake up everyone. Kidnapping Catherine seems to be the only choice he got. But it's the last thing in his mind. Where would he bring Catherine if he successfully kidnaps her? There's a lot of work involved in kidnapping a person, it needs meticulous planning and the truth is he has no energy and resources for that.
Thelma was cooking dinner in the kitchen adjacent to the toilet.
He can no longer use the odorless and tasteless drugs to mix with the drink because Thelma no longer allows it. It seemed he was met with a dead end.
'I won't lose hope yet!' he said to himself. His eyes caught the key of the house dangling in the cabinet.