The Mystery of the Guide Dog by Gertrude Chandler WarnerBenny - He is one of the Alden children. She is six years old..Jessie - She is one of the Alden children. He is twelve years old. Henry - He is one of the Alden children. He is 14 years old. Viola – She is one of the Alden children. He is ten years old. Grandpa Alden – He is the grandfather of the Alden children. They live with him. Jason Peters - He is a trainer at Greenfield Guide Dog School. Carter - She is the owner of the Greenfield Guide Dog School.Ginger - She is a Golden Retriever who is a guide dog.Mrs. Davis - She is a woman who owned Ginger. Gerard Dominick - He is a man who wants to buy Ginger. The setting of the story is the small town of Greenfield and the Greenfield Guide Dog School. Henry, Jessie, Violet and Benny Alden had gone into downtown Greenfield to pick up some things for dinner. Outside the grocery store, they encounter a blindfolded man led by a golden retriever. The man was Jason Peters, who worked at the Greenfield Guide Dog School owned by Mrs. Carter, who they soon met. Mrs. Carter went to school with Grandpa Alden. Mrs. Carter talks to Grandpa Alden and asks him if the children can come and help out at the guide dog school for a week. Grandpa says yes, and the children pack their bags and are taken to school. At school, as Jason showed the children how he trained a guide dog, a large black car approached and a woman got out. Ginger ran to the woman. The woman, Mrs. Davis, owned Ginger. Jason and Mrs. Davis talked. Jason was angry that she was there. The woman left. Anna Chang, a blind girl, came to school to start working with a guide dog. The children quickly made friends with Anna. While Jason was talking to Anna, Benny saw a well-dressed man hiding in the woods. Anna received Ginger as her new guide dog. Later, a man came to Mrs. Carter's office while the children were working there and wanted to buy Ginger. The children told him he needed to talk to Mrs. Carter. The children told Mrs. Carter about the man.