In the touching fourth novel set in the Old Man’s War universe, Scalzi revisits the events of 2007’s The Last Colony from the perspective of Zo?, adopted daughter of previous protagonists Jane Sagan and John Perry. Jane and John are drafted to help found the new human colony of Roanoke, struggling against a manipulative and deceitful homeworld government, native werewolf-like creatures and a league of aliens intent on preventing all space expansion and willing to eradicate the colony if needed. Meanwhile, teenage Zo? focuses more on her poetic boyfriend, Enzo; her sarcastic best friend, Gretchen; and her bodyguards, a pair of aliens from a race called the Obin who worship and protect Zo? because of a scientific breakthrough made by her late biological father. Readers of the previous books will find this mostly a rehash, but engaging character development and Scalzi’s sharp ear for dialogue will draw in new readers, particularly young adults.