My try: Tomorrow, I will return to the scene of the crime ( and / to) go over it with a fine toothcomb. If you use "and", this will mean that you will surely return to the scene of crime and go over it witha five toothcomb but this may not be the only action you will do. Because your only purpose is not to go over it with a fine toothcomb, you may do something else too.
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