The story is set in England, primarily in Swindon - a town between Bristol and London - and in London itself. The events occur in 1998.
Christopher John Francis Boone - The book's narrator, Christopher is fifteen years old, gifted
in mathematics, and has Asperger's Syndrome, a high-functioning form of
autism. He lives at 36 Randolph Street with his father.
Ed Boone – head of Crenshaw High School’s gifted magnet program
Judy Boone – Christopher's mother, who Ed told Christopher died two years
ago when she actually moved to London with her lover, Roger Shears.
Siobhan – Christopher's main teacher since he was twelve.
Eileen Shears – A neighbor of Christopher and ex-wife of Roger Shears. Lives at 41 Randolph Street.
Roger Shears – Former husband of Eileen Shears, a banker who moved to London with Christopher's mother.
Mrs. Alexander – Another neighbor of Christopher's who, she is an older woman who tries to befriend Christopher.
Wellington – A large poodle with black fur owned by Eileen Shears, found dead at the start of the novel.
Toby – Christopher's pet rat.