Perfect

"In 1972, two seconds were added to time. It was in order to balance clock time with the movement of the Earth. Byron Hemming knew this because James Lowe had told him and James was the cleverest boy at school. But how could time change? The steady movement of hands around a clock was as certain as their golden futures. Then Byron's mother, late for the school run, makes a devastating mistake. Byron's perfect world is shattered. Were those two extra seconds to blame? And can what happened ever be put right?"--Publisher description.