It's been six months since the Adina's Deck detective club solved their first mystery. At the time, the four 8th grade friends vowed to help anyone, anytime they need it. This time, it is Michael who needs help. He notices something suspicious on his friend Ally's computer while at her house. Who is Ally always talking to online? Michael's spying unravels too much information. So much, that he has to do something about.