福尔摩斯的探索之斑点带子（英文总结）

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One pair of twin sisters live with their stepfather in an outskirts villa. One day , the older sister of the twin died weirdly, since then the younger one started to experience some strange things as well, she became spiritless , then she went to Sherlock Holmes for help.
Because their mother left them a batch of wealth after she passed away, so the father who was friendly and kind in usual wanted to kill the twins and steal the assets. He trained a venomous snake, used the snake murdered the older sister, and wanted to skill the other one again.
But he got his retribution, Holmes had found the truth and made the greedy and evil father pay back unwittingly.