The Van Duren girls were all very smart and good at sports. Haylie and Rachel were 10-year-old twins. Haylie was strong and could even beat up the boys if she wanted to. Rachel could think her way out of any situation. She was the all-city checkers champion, and could even play chess and beat grown-ups, something that no other kid in her grade could do. Kayla was only seven, but she was a quick thinker and could keep up with her sisters, both on their bikes and using her brain.
When the three of them team up to form a detective agency, no mystery stands a chance! As the sisters patrol the streets of Lake Alamo on their bikes, they're ready to take on any challenge. The Van Duren sisters solve mysteries of all kinds, from secret identities to stolen items to bullies, these sisters are ready to take it all on, one case at a time.