Odd Sorta Murders

Darkness, Beautiful DarknessDaren Clowers had a difficult childhood. He learned to hide early as a simple survival trait. He was a normal-seeming type of person in the daytimeThen came the night. Not Quite Dead EnoughDet. Lt. Andy Forbes knew this would be a rough case from the first call. The second and third confirmed the idea. Insufficient EvidenceA perfect murder is impossible. You can have an un-detected murder, but that is not perfect.
So. The best you can do is insufficient evidence. They will know you did it, but can't prove it. That will have to do. A Rite to Kill    Wendy Adams was the island's top gardener. She had tremendous success with all types of plants. She even grew a lot of things that wisdom said would not grow there. When asked how she managed to keep such healthy plants in that kind of insect-infested place she answered that she had almost a set of rites she always followed.
It got rid of pests very effectively. Then a few pests died in her garden who were not insects, snails, mites, or mice.