Mycroft finds out 20 years after an 'incident' that he hoped to forget about led to a son. His son who is very much a Holmses, in intelligence, awkward understanding of social understanding, and amazing observation skills. His son grows up American and is recruited as special intelligence by the government after high school.

When Britain is under attack America sends Mycroft's son to help. Mycroft somehow realizes the agent is his son. Being over protective of family Mycroft tries to recruit his son.