Instruct: Classify a given review as either positive or negative.
Query: thoughtful, action-packed, stranded-in-the-past fiction

outstanding, fast-paced novel for readers of hard-science fiction. sailing/blacksmithing/primitive warfare/whaling/bronze age cultures. how do modern people survive in the bronze age without a large technologic civilization to back them up? thought provoking at many levels. warning: fairly explicit sex and violence may offend.