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I'm having some trouble parsing this sentence:
ピーターのことを、どうかよろしくお願いします
The translation by my interpretation is something along the lines of "As to Peter I will leave it in your hands" (i.e. I will let you take care of Peter). However I am confused at what the precise role of どうか is in this sentence.
Semantically there's no difference between with and without どうか in your phrase. As @Eddie Kal correctly points out in the comment, どうか just makes it more polite.
Examples:
Do not mix it up with どうかする, which means something like "to become crazy".
