Michaela and Sully travel by train to Boston with their children Brian and Katie to be at Colleen's graduation. Upon arriving they find that Michaela's mother just about to be released from the hospital but instructed that she needs complete bedrest. Colleen must face the fact that a woman doctor will not be welcomed at any Boston medical office. Brian gets a job while everyone is busy with Colleen's graduation and his Grandmother's failing health.
As Colorado Springs' Commisioner, Sully opposes a deal to mine for copper to make electricity. In order to sway Sully's decision, Mr. Garrick threatens Sully. Sully and Michaela's daugther, Katie, is then kidnapped while the town celebrates Michaela's birthday. The search for Katie takes Sully, Micheala, and their friends on an adventure through Mexico that is filled with danger at every turn.