The mystery at the crystal palace by, Carolyn Keene

It is about how Nancy Drew and her 2 friends Bess and George go to Minneapolis to solve a mystery. The mystery takes place at an ice-skating rink run by her friend Alison who was left it by her Uncle who died. The case is that a bunch of money is missing that was left for Alison from her uncle. Nancy has to find where the money is becauuse the rink is running out of money from all the repairs it has needed. -Ruby