Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather and they have become friends with a real pro-hockey player.   The Boxcar Children cannot believe it when they meet their favorite hockey star, Kevin Reynolds, while out skating one day. Kevin is coaching a girls' hockey team and planning to build a huge new skating rink right in Greenfield. Kevin offers Jessie a place on the team and Henry is going to be assistant coach! As soon as practices begin, however, strange things start to happen. Suddenly, equipment is missing and Kevin's plans for the new rink are almost ruined. Is someone trying to prevent Kevin's new rink from being finished? The Boxcar Children want to help their new friend and solve this mystery!