The Merlinus Agency — Janet Morgan

What would you do if you were twelve, all alone and homeless, with nothing except an antique typewriter? The orphan girl finds herself following a mysterious golden line of light leading to a shabby building hidden up Birmingham's narrow alleys. Between one exciting Christmas and the next, she helps set up a magical agency hiring out wizards. Can they use their different talents to help the children with their problems? In the end, the discovers a wonderful secret...