All Clear is the conclusion to Connie Willis’s two-volume account of love, war, and time travel. Like its predecessor, Blackout, it is a work of science fiction and a recreation of 20th century history.

The story begins in the immediate aftermath of Blackout. Three time-traveling scholars, each investigating a different aspect of World War II, are stranded together in London during the Blitz. Their attempts to return to the year 2060 form the core of a narrative that ranges across time and space, from the evacuation of Dunkirk to V-E Day—and beyond.

The work uses chaos theory and temporal paradoxes to reconstruct the era, illuminating it through the perspectives of the soldiers, sailors, shop girls, and ambulance drivers who struggled through it.