Release Message:  Historians conduct field work by traveling into the past as observers, using a time-travel portal called "the Net", which remains in the time-traveler's present, while sending the time-traveler to a particular location (called "the drop") and time. Written by Connie Willis.

Description:  Blackout and All Clear are the two volumes that comprise a 2010 science fiction novel by American author Connie Willis. Blackout was published February 2, 2010 by Spectra. The second part, the conclusion All Clear, was released as a separate book on October 19, 2010.[1] The diptych won the 2010 Nebula Award for Best Novel,[2] the 2011 Locus Award for Best Science Fiction Novel,[3] and the 2011 Hugo Award for Best Novel.[4][5] These two volumes are the most recent of four books and a short story that Willis has written involving time travel from Oxford during the mid 21st century. Willis imagines a near future (first introduced in her 1982 story "Fire Watch" and featured in two of her previous novels: Doomsday Book and To Say Nothing of the Dog) in which historians conduct field work by traveling into the past as observers. The research is mainly conducted at the University of Oxford in England in the mid-21st century. In their world, time-travel has been known since the early 21st century. The time-travel device, a portal called "the Net", remains in the time-traveler's present, while sending the time-traveler to a particular location (called "the drop") and time. They can return from the same location when someone in the future re-opens the Net for them at an agreed upon "rendezvous" time. The Oxford Time-Traveling Historians Time travelers from 2048 go to the London Blitz during World War II to observe and end up being part of it. Blackout and All Clear Novel published in two parts.