Introduction: Confronting a shrinking world -- Reuniting pangaea -- Wheat and trout, weeds and pestilence -- Elbowing out the natives -- The good, the bad, the fuzzy -- The making of a pest -- Taking risks with strangers -- Stemming the tide -- Beachheads and sleepers -- Taking control -- Islands no longer -- Can we preserve integrity of place? -- Appendix A. 100 of the world's worst invasive alien species -- Appendix B. Index to scientific names of cited invasive species.