S4 E2 - A woman who's been missing for over 35 years turns up dead. McDonald and Dodds' investigation takes them into the heart of one of Bath's wealthiest families.
E1 - In search of the country's largest ground beetle, Ray travels across Dartmoor's granite peaks and into its mysterious oak forests.
E7 - With seemingly endless shores and awe-inspiring rock formations, Lake Superior is the greatest of the Great Lakes.