Sir William is a sophisticated knight who happens to be a mouse living in today's world, keeping the profession of knighthood alive.
During King Arthur's reign, there lived twelve mice. These mice were brave knights living their lives following twelve Codes of Chivalry. Centuries later, their descendants are trying to keep their forefathers' traditions alive.
One of those brave knights, Sir William Wilkinson of Winchester, has recently adopted a human family and is living with them in New York City. His sole duty is to serve and protect them as a Knight serves and protects his King. But slowly, he gets more involved in their lives, particularly in the life of Sid, an Indian boy who goes through a difficult time while playing his favourite sport, soccer.
Sir William happens to be the best candidate to help Sid as he himself dealt with a similar situation in his past. The only problem, Sid does not know of Sir William's existence until it's too late.
Can Sir William help Sid? Is Sid able to resolve his problems? What could possibly be in common between an Urbane Knight and a nine year old boy?