How does the saying go? Just because you're paranoid, it doesn't mean they're not out to get you . . . For Ruth, a new mother recovering from postpartum psychosis, every day is difficult and, after months spent hearing voices in the walls and trusting no one, she's no longer confident in her own judgement. Neither, it seems, is anyone else. So, when she hears a scream from the local petrol station one night, she initially decides it must be her mind...