Over the course of a long, hot summer in London, the lives of three very different married couples collide when their children join the same tutoring circle, resulting in illicit relationships, shocking violence and unimaginable fallout. As the weeks go by, the couples become very close. Resentments flare. An affair begins. No one sees the five children at their secret games or realize how much their family dynamics are changing until tragedy strikes. The story twists and then twists again while the three families desperately search for answers. It’s only as they begin to unravel the truth of what happened over the summer that they realize evil has crept quietly into their world. But has this knowledge come too late?