A new toxic chemical is causing panic in San Francisco. One night Jim Reilly and his teenage friends explore an abandoned mansion with a mysterious history, and discover something terrible...Easy reading in American english, wide range of fun activities in the four skills, KET- style exercises, Trinity- style exercises (grade 3), informative dossiers on A guide to San Francisco and natural resources and pollution, project work using the web, exit test with answer key, full recording of the text.