Twin Surprises Author:Susan Beth Pfeffer Betsy and Crista did everything together. They played with Marty together. They teased Grace together. They had all the same friends. "I want to do this by myself," Betsy said. "That way it's Crista's party and not mine." Mrs. Linz put down the lettuce she was washing. "It sounds like you want to give Crista a surprise party."