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I'm trying to find it funny that the 90s are trending, especially 90s childhoods and parenting, because that's when my own daughters were small. And it was thirty years ago; in 1978 when we were wearing poodle skirts for 1950s days when I was in middle school and watching Grease and Sha Na Na's variety show, we were only looking back twenty years, and that seemed like ancient times! With the Sestercentennial, it's a great time to take a look at some historical fiction.
July 14, 2026 by Calkins Creek
ARC provided by the publisher
In 1979, Theodora Underwood's parents are more interested in following their own scientific interests than in "Thunder", so she is tutored by a nanny in Boston during the school year and shuttled off to various relatives in the summer. She is used to being alone, and has a lot of initiative. When she tires of staying with a college aged cousins, she managed to travel by bus and taxi to Philadelphia to stay with her Aunt Hazel in her crumbling historical mansion in Fairmount Park. Thunder's parents consider Hazel "hippie-dippie", and certainly the organization of the house is more carefree than the methodical ways of the other Underwoods. She is very welcoming to her niece, however, and gives her her own room, specially decorated for her, as well as a notebook. Since most of her relatives were just annoyed to have to deal with her, Thunder is pleased. She is even able to have a storage closet for her own hideaway. When she finds a 200 year old letter there written by Margaret "Mercy" Percy, she carefully handles it, and when she tells Hazel about it, is allowed to keep it and investigate the mystery it outlines. The house had been owned by Benedict Arnold, and the letter mentions his wife, Peggy, and has cryptic clues to the whereabouts of Mercy's journal. Hazel gets help with the house from handyman Mr. Dixon, as well as Pop Jackson, who has two children, Charlie and Heather. Thunder isn't used to having friends, but gets drawn in to the Jackson children's plans, especially when they help her with the mystery. There is also a prowler in the area, purportedly looking for an important ring. After finding Mercy's journal, the children embark on a sometimes treacherous investigation to try to uncover the identities of women spies during the American Revolution. Thunder enjoys the hunt, and loves living with her Aunt and talking to people like Professor Maggie Kenner. As the summer draws to a close, however, will she have to return to being homeschooled?
Thunder is an engaging character who is having trouble understanding why any adults would find her company valuable. Aunt Hazel is delightful and welcoming, and her house, while it needs a lot of renovation, offers much scope for the imagination. There are hidden passages, very old documents, and other artefacts that are quite interesting. I appreciated that Thunder didn't keep too many secrets from Hazel, and Hazel gave her a lot of leeway. Watching Thunder interact with the children in the neighborhood was also interesting, and her desire to remain with a supportive and fun community is understandable, especially since her parents don't seem very pleasant.
The mystery is well developed, and there are a lot of clues and information about the Revolutionary War, which is especially nice during the Sestercentennial! This reminded me a lot of books I read in the 1970s, with plenty of details from the journal about goings on. Fortunately, the journal entries are in a different font that has some characteristics of cursive by is closer to print, so young readers can decode it Real historical characters are referenced, and readers who are interested might want to pick up Sheinkin's The Notorious Benedict Arnold for more information. There is some tension when neighbors are suspected, but I don't want to give away any twists and turns.
There are plenty of details about life in the 1970s, and popular movies and songs are mentioned frequently. Since I was about Thunder's age at this time, I can tell you they are pretty much spot on, although by this time I am not sure we would have been wearing an orange polyester pantsuits. That seems more 1975. Fashions changed incredibly quickly in this decade!
Readers who love history and are up to the challenge of 368 pages of history and clues, and who enjoyed Durst's Spy Ring or Landis' Capitol Chase, will look forward to this title by the author of Goodbye, Mr. Spalding.
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