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To understand this chapter you should be familiar with "News and Post" from the main story.
Dursley,
Due to circumstances outside of my control I will be forced to leave my godson with you for several weeks this summer. It has also come to my attention that your past treatment of him has been less than satisfactory. I have taken a personal interest in Harry's welfare, and as such I have several requirements with respect to his well-being. These are as follows:
While Harry is living with you, you will give him adequate food. You will not lock him into his bedroom, the cupboard under the stairs, or any other room in the house. You will not make him do any chores unless you assign them to your own son as well. You will not allow your son to do him harm. You will not take away his wand or any of his other school supplies, nor will you make any attempt to prevent him from studying magic. From what Harry has told me I cannot expect anything better from you, but you will do these things at the very least, because I will find out if you do not do as I have asked.
During the time he is under your roof Harry will be in regular contact with me. If you mistreat Harry, I will know, and I will come to your front door to rectify the situation. If I do not hear from Harry for three days in a row, I will also come to your front door. If you try to prevent Harry from incriminating you in his letters he will use a code word which is known only to him and myself, and I will come to your front door then as well.
Do not underestimate me, Dursley. I have just spent twelve years in a hell which it is beyond the capabilities of your feeble brains to even imagine, and it was for Harry's sake that I broke out. Know that I am not above committing murder to prevent Harry from suffering any more than he already has, and when one has access to magic there are things far worse than simple killing. You have been warned.
Yours Sincerely,
Sirius Black