The series has Hetty starting her own investigation agency at the age of 60, when she determines hat she has a knack for ferreting the truth. She is assisted by her sidekick Geoffrey, played by Dominc Monaghan (from Lord of the Rings films and Lost), pilots the scooter and helps Hetty with her investigations. Not every episode has a scooter, but you'll find it interesting nonetheless if you enjoy the sort of programming that Mystery! brings.
You can get the first season at Amazon for a discount, but it looks like some independent sellers have it at a nice discount. Go Hetty!