Walk the Plank (The Human Division)

Wildcat colonies are illegal, unauthorized, and secret - so when an injured stranger shows up at the wildcat colony New Seattle, the colony leaders are understandably suspicious of who he is and what he represents. His story of how he’s come to their colony is shocking, surprising, and might have bigger consequences than anyone could have expected. Walk the Plank is a tale from John Scalzi's The Human Division, a series of self-contained but interrelated short stories set in the Old Man's War universe.