On May 4, 2019, a woman was out on her daily walk with her two dogs in The Hague. But unfortunately, this would be the last walk she would ever take. Her body was found about 10 minutes away from her house. Three days later across the country in Brunssum, two other dog walkers would be found dead when out on their daily walk. What was happening in The Netherlands? The answer involves a young man, a mental illness, and some car license plates.