The Mystery of the Mischievous Marker / El misterio del malvado marcador

It's Monday morning, and kid detective extraordinaire Mickey Rangel is on the hot seat. "You must be wondering why I've called you to my office," said Mrs. Abrego, the school principal. And in fact, Mickey has been racking his brain and sweating bullets, trying to figure out what he has done to warrant being pulled out of homeroom. Could it have been the spitball fight with his twin brother Ricky on the bus? How could word have gotten to Mrs. A that quickly?

When she instead brings up the recent rash of graffiti on school grounds, Mickey is initially horrified that she might think he's involved. But he quickly realizes why she has called him in: she needs his help! Mrs. A has heard that Mickey is a detective, and he confirms that he's the "real deal," with an online certificate to prove it. She wants him to unmask the Mischievous Marker, the person writing messages all over the school"s walls.

The culprit has left numerous clues in his postings mainly a pronounced lack of grammar and spelling skills and that, along with an anonymous message from a supposed eyewitness pointing the finger at Mickey's life-long nemesis, Bucho, seem to make for an easy case to solve. But Bucho has denied the accusation and asked for Mickey's help. So Mickey flabbergasted but intrigued is "on the case."