Moose is the 12-year-old protagonist of the novel. He moves to Alcatraz with his parents, Mom and Dad, and his older sister Natalie, who has a severe disability and requires constant supervision. Moose…
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Natalie Flanagan
Natalie is Moose’s older sister, though Mom has insisted for years now that Natalie is 10 (Natalie is actually 15 and turns 16 at the end of the novel). She has a severe disability…
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Mom/Helen Flanagan
Moose’s mom is a homemaker, though she also earns money teaching piano lessons to children. When she’s not teaching, she throws herself into caring for her daughter, Natalie, who is actually 16 but…
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Dad/Cam Flanagan
Moose’s dad is an electrician, though on Alcatraz, he also works as a prison guard. An honest and supportive man, Dad agrees to move the family to Alcatraz so that Natalie can attend…
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Al Capone
One of the most infamous real-life criminals of the 1930s, Capone is incarcerated on Alcatraz and is the prison’s highest-profile convict. Piper is intent on seeing and ideally meeting him, and many of her schemes…
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Piper is the scheming and domineering daughter of Warden Williams. She’s beautiful and Moose’s age, and it’s implied that Piper and Moose nurse mutual crushes throughout the novel. The ringleader of the children…
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Theresa Mattaman
Seven-year-old Theresa is Moose’s first friend on Alcatraz. She’s immediately accepting of Natalie and wants to make sure Moose is her friend before he befriends anyone else—so she only tells him later that her…
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Jimmy Mattaman
Jimmy is Theresa’s older brother and one of Moose’s friends on Alcatraz. He’s about Moose’s age and Moose is initially hopeful that Jimmy will play baseball with him. But Jimmy is mostly…
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Annie
Annie is one of the band of kids on Alcatraz; her father is a guard. She’s stout, blond, and very focused on homework—so Moose is surprised that she’s also the only kid on Alcatraz…
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Warden Williams
The frightening and powerful warden of Alcatraz is also Piper’s father. He’s the boss of every employee at the prison, and in addition to overseeing the convicts, he also demands complete obedience from his…
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Mrs. Carrie Kelly
Mrs. Kelly is the final expert that Mom consults about Natalie. At first, Moose isn’t impressed: Mrs. Kelly insists Natalie can’t have her beloved button box, and she also says it’s important that…
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Rocky Mattaman
Rocky is the fifth Mattaman child; he’s born a few weeks after Moose’s family moves to Alcatraz. Theresa is extremely possessive of her baby brother, insisting before his birth that he’s her baby…
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Teresina Capone
Al Capone’s mother, Mrs. Capone, comes to Alcatraz to visit her son one Sunday morning. Piper ropes as many kids as she can into riding the boat to San Francisco and back so they…
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105/Onion
105 is a young convict at Alcatraz who forms a friendship—and perhaps a romantic relationship—with Natalie. He’s nicknamed Onion due to his slicked-back hairstyle. While Moose can verify nothing about the man, Piper insists…
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Scout
Scout is a kind and easygoing kid in Moose’s class and one of the after-school baseball game team captains. He tries to accommodate Moose’s schedule so Moose can play, though when Moose can’t make…
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Gram
Moose’s grandmother never appears in person in the novel, but she’s cared for both Moose and Natalie at several points over the years. While Natalie spent a lot of time at Gram’s house in…
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Minor Characters
Del
Del is a popular kid at Moose’s school and one of the after-school baseball game team captains. He’s very upset about Piper’s scheme to run classmates’ laundry through the Alcatraz laundry system, and so his father sends the warden a letter informing him of the scheme.
Mrs. McCraw
Mrs. McCraw is a distant relative of Mom’s. Some time before the events of the novel, she told Mom to put Natalie in an asylum—and Mom asked her to never come back.
Miss Bimp
Miss Bimp is Moose’s unsmiling and matronly Advanced English teacher.
Pete
Pete was Moose’s best friend in Santa Monica. Though Moose writes to Pete a few times after he moves, they gradually grow apart.
Mrs. Mattaman
Mrs. Mattaman is Theresa and Jimmy’s mother. She has her fifth child, a son named Rocky, a week or two after Moose’s family moves to Alcatraz.
Meeger
Meeger is a boy at school who plays baseball with Scout and Moose.
Mrs. Caconi
Mrs. Caconi lives in the apartment next to the phone, and as such, she’s the one to alert other residents when they have a phone call. Moose thinks she’s ill-suited to this job, as she’s overweight and struggles to climb the stairs to upstairs apartments.
Bea Trixle
Bea Trixle, Mr. Trixle’s wife, is one of Moose’s family’s neighbors. She gives perms in her kitchen and thus runs the only “beauty salon” on Alcatraz.
Mr. Trixle
Mr. Trixle is a guard on Alcatraz.
Weasel
Moose and Piper encounter Weasel, an Alcatraz inmate, on the boat headed to San Francisco for an appeal. Piper explains that he knows as much about the law as trained lawyers do.