Flights and Chimes and Mysterious Times, by Emma TrevayneRead about the other entries on the list.
The neglected child of rich parents, Jack is the perfect target for a ruthless otherworldly Lady, who lives in an alternate, steampunk London and longs for a human son. Jack enters the world of Londonium by magical means, and once there finds himself torn between continued adventures and returning to the safety of home. Ratcheting danger, atmospheric writing, and quirky characters such as the indefatigable mechanical girl known as Beth Number Thirteen will keep your kid fully invested in Trevayne’s action-packed world.
--Marshal Zeringue