Book 2 in the electrifying middle-grade sci-fi trilogy by six-time Grammy Award–winning musician, Academy Award–winning filmmaker, and New York Times–bestselling author Ahmir "Questlove" Thompson and New York Times–bestselling author S. A. Cosby.On the heels of their thrilling appearance in Rhythm of Time, best friends Rahim and Kasia are back traveling through time in Time for a Change. Last time around, they were on their own—now they are working with Aevum, a mysterious organization from the future that tasks them with averting disaster and safeguarding the flow of history.The first assignment sends Rahim to Hawaii to recover a rock that Aevum insists is key to stabilizing the future. But things take a dramatic turn when he inadvertently jeopardizes the mission, thrusting him and Kasia into a web of intrigue populated by a diverse cast of time-travelers with their own enigmatic motives. There are doppelgängers from...

From the Academy Award–winning, Grammy-winning, and New York Times bestselling author Ahmir “Questlove” Thompson and the New York Times bestselling author S. A. Cosby comes this thrill-a-minute novel—the first in a rollicking time-travel adventure series that’s perfect for fans of Amari and the Night Brothers and Tristan Strong Punches a Hole in the Sky.Seventh grader Rahim Reynolds loves testing out the gadgets invented by his brilliant friend Kasia Collins. First there were the X-ray glasses and all the trouble they caused. Now there’s the new cell phone she built for his birthday, even though his parents won’t let him have one. But Rahim is excited to use the phone to search for videos of his favorite old-school rap group. What he doesn’t know is the phone has a special battery that interfaces with a secret government satellite, which spells trouble when the phone transports him back to 1997....