I'm listening to The Night Guest by Fiona McFarlane, read by Federay Holmes. It's about Ruth Field, an elderly widow who lives alone in an isolated house beside the sea somewhere near Sydney, Australia.
Ruth wakes up in the middle of the night and is convinced that there is a tiger in her living room. The next day a stranger arrives at her door and introduces herself as Ruth's new carer, sent by the Government. Ruth's memory is failing and Frida the carer may not be entirely trustworthy......