June 21st. The summer solstice. It's eight thirty in the evening and the sun still has an hour to drop towards the horizon to mark the end of the longest day of the year. Boom and I are watching from a vantage point on Incleborough hill on the coast between Cromer and Sheringham. We were here on the same date four years ago when I was writing Tales from Iceni Territory and being up in Norfolk this week, it was the only place to be this evening. You only have to understand a l