The harrowing Search and Rescue series returns, this time following Ricky, a rescue dog digging through the rubble of Ground Zero to save who he can, and Cassie, a girl who will do anything to save her mother from the wreckage. Fifth grader Cassie has lived her whole life in Lower Manhattan. She knows every vendor, has explored every street, and as a New Yorker who's seen everything, knows that nothing can surprise her anymore. That is, until the morning of September 11th, 2001. Cassie is in class when the first plane hits the North Tower, where her mother works. She can see the smoke from her classroom's windows, can feel the building shake. Without thinking, she dashes out of school and heads to the towers. Cassie knows every inch of that building--if anyone can save her mother, it's Cassie.

But when the second plane hits, and the buildings come crashing down, it will take more than street smarts to survive. Meanwhile, NYPD rescue dog, Ricky, is a friend to all and hero to many. He's in a training session when the first plane crashes, and must immediately spring into action. His task is to save as many people as he can find from the rubble. But as hope for survivors fades, he'll have to learn that sometimes heroism means helping people pick up the pieces of what is already destroyed. Together, Cassie and Ricky will have to work to save who they can, and survive the darkest day in New York City history.