In the waning months of the second World War, a group of children discover a tunnel in their neighborhood outside London. For that summer of 1944, the subterranean space becomes their “secret garden,” where the friends play games, tell their fortunes, and perform for each other.

Six decades later, construction workers make a grisly discovery beneath a house on the same land: a tin box containing two skeletal hands, one male and one female. As the hands make national news, the friends come together once again, to recall their long ago days for a detective. Then the police investigation sputters, and the threads holding their friendship together begin to unravel. Is the truth buried amid the tangled relationships of these aging men and women and their memories? Will it emerge before it’s too late?