The story in this book, set principally in the nowadays United States, follows two secret agents, Peter Cushing from the United States and Tiffany Li from China, on their adventures to chase after building-leaping, dagger-throwing members of the ultra secret society, the Blood Drippers Clan, in their quest to quell a covert operation that employed unknowing X agents embedded within the United States to carry out deadly missions. Along the way, Peter and Tiffany had to deal with assassinations, deaths and incidents involving the use of radioactive materials as well as a tight schedule.