Six days
by Philip Webb
Cass and her brother Wilbur scavenge in the ruins of a future London seeking an artifact for their Russian masters, but the search takes on a new urgency after the arrival of Erin and Peyto, strangers from afar who claim to hold the key to locating the mysterious object.
Science fictionFictionAntiquitiesSpace and timeBrothers and sistersJuvenile fictionChildren's fictionBrothers and sisters, fictionSpace and time, fictionLondon (england), fictionSiblings