Marco's new neighborhood may be better than his old one, though it still has its share of abandoned buildings, addicts, and homeless people -- but he's left his friends behind, and the summer before fourth grade is shaping up to be a lonely one. He entertains himself by breaking off car antennas until, in a visionary moment, he realizes that he has Powers -- he can talk to anyone without fear, and also visualize what's about to happen. Both come in handy -- in converting Tyrone, a hostile classmate, from bully to friend; in preventing Tyrone from injuring a potentially violent homeless man; and when Marco figures out that Tyrone is stealing from his Uncle Albert's grocery, where they both work, and engineers a second chance for him. Though Willis's writing sometimes lacks grace (Tyrone is introduced as a mainstreamed ""hyper"" and the homeless man, Crazy Wee-wee, as an ex-""hippy""), and her characters are young for the book's probable audience, she makes a promising debut with this tale of a clever young peacemaker in a rough neighborhood. Illustrations not seen.