It's 1976, and the UK has its hottest summer on record. Across the Atlantic, the USA is celebrating its bicentennial. For the Meldrums, and Mac and June, it's a time of upheaval, bad news, and an unexpected trip to California. Grandpa continues to color outside the lines, Mac gets to see the Queen, and a long-held secret comes to light in this, the second of the Mac and June Trilogy.