Day 1 starts and ends at midnight, on the day of the California presidential primary. Bauer's wife and daughter are kidnapped by a terrorist group plotting to kill presidential candidate David Palmer. A mole inside L.A. Counter Terrorist Unit (CTU), Jamey Farrell, is exposed, but does not provide any information that could help the investigation. When it is revealed that the man behind his family's kidnapping is someone from his past, Jack eventually realizes everything that has happened has to do with both him and Senator David Palmer personally, while information is uncovered that there may be another mole inside CTU. Jack ultimately has to balance his professional agency role with his family life.