I missed the very beginning, but Joan collapses and is taken to the hospital where she is diagnosed with Lyme Disease. The doctor tells the family that she has probably had it for quite some time and that the symptoms are mood swings, odd behaviour, and hallucinations. Suffice to say that Joan questions whether her 'seeing' God is in fact real or just the symptoms of the Lyme Disease! Medication will cure the disease so the viewers are kinda left hanging as to whether she will still be able to talk to God. Alot of the characters who have played God over the season returned to visit her and I didn't quite understand the part where her father realizes that a woman who died while he was on duty, came to him at the hospital to tell him about some important information about the suspect. Maybe someone else could better explain that part so even I could understand...?