Police in a New York City suburb report the young man did the detective work in tracking down a 17-year-old accused in a bike theft.
Scarsdale police say the 13-year-old's nearly $2,300 mountain bike was stolen while the kid was in a deli.
The boy did the leg work on the Internet and says he found his bike for sale on eBay.
Officers arrested the 17-year-old for possession of stolen property.
He was released to his parents and his due in court October 1st.