Two questions form the foundation of all novels: "What if?" and "What next?" (A third question, "What now?", is one the author asks himself every 10 minutes or so; but it's more a cry than a question.) Every novel begins with the speculative question, What if "X" happened? That's how you start.
Tom ClancyOf all human lamentations, without doubt, the most common is if only I had known. But we can't know, and so days of death and fire so often begin no differently than those of love and warmth.
Tom Clancy