baby-sitters little sister #2: karen's roller skates

It's going to be a great weekend! Karen has new roller skates and is a very good skater. She's looking forward to trying some new tricks. But, oh no! Karen falls down and has to go to the hospital. Her wrist is broken! Karen is determined to get everyone she knows—plus someone famous—to sign her cast. It isn't going to be easy, but she won't give up until the job is done.