The book is extensively researched using previously unpublished materials, personal letters, and historical documents, making it one of the most accurate and comprehensive accounts of the Marx family's private life.

While political events and theories provide the backdrop, the primary focus is on the personal relationships, daily struggles, and intimate moments of the Marx family, offering a unique perspective on how their private life influenced Marx's public work.

The book reveals Marx as a complex individual who loved parties and pranks, struggled with deadlines, and deeply loved his family, providing a stark contrast to the usual stern, purely intellectual portrait presented in most historical accounts.