Mystery on Taboga Island by Patricia Maloney Markun, 1995.
Amy is excited to be spending the summer with her aunt on Taboga Island, off the coast of Panama, near the Panama Canal. Aunt Rhoda is a curator for an art museum, and she is writing a series of art lectures. In particular, she has an interest in Paul Gauguin, who painted in Panama in the late 1800s. She has invited Amy to join her for the summer not only so that she can visit another country but because of their mutual interest in art. Amy loves drawing and painting and wants to be an artist someday.
The one drawback of going is that Amy is worried that she will be lonely over the summer. She doesn’t know whether there will be any kids her age close by or if she would be able to talk to them if there are because she doesn’t speak Spanish. Fortunately, soon after they arrive on Taboga, Amy meets Zoe. Zoe is from California but she comes to visit her relatives on Taboga every year. She introduces Amy to her cousin, Juan, as well. The three of them become friends, and Zoe and Juan even share their special, secret hiding place with Amy: a old lookout point on an old, abandoned pier left from World War II that can only be reached by walking on a narrow beam over the water.
They also introduce Amy to Madame Odelle, who people call The Bird Woman because of all the birds she keeps around her house. She is a widow who lives alone and hardly ever sees people, but she invites the children in and when she learns that Amy is interested in art, she shows them a special painting that her family has had for generations. Madame says that her grandfather bought the painting years ago from a traveling Frenchman who was in need of money. Amy thinks that it looks like one of Paul Gauguin’s paintings, and she knows that some of his work is unaccounted for. However, the initials on the painting are PGO. What could the ‘O’ stand for?
Then, the painting is suddenly stolen, and there’s no shortage of suspects. A strange woman named Phoebe Quincy has been lurking around Madame’s house and asking questions about her. There’s also Donald S. Deffenbach, a birdwatcher who doesn’t seem to know much about birds, and Captain Billy, an Australian who owns a sailboat that he sails himself. Dr. Denis Dobson, who is also a Gauguin expert, also happens to be staying at the resort on the island. He is visiting places where Gauguin painted while writing a book about him. Could he be the thief?
I like this book for the pieces of history about Panama and Paul Gauguin, which are important in solving the mystery and understanding the origin of Madame’s mysterious painting. One of the things I remembered most about reading this book as a child, though, was when Amy and her aunt were eating at the little restaurant on the island and her aunt urged her to try a Panamanian dish so that she could get used to trying new foods when she travels. Amy tries a tamale for breakfast and loves it, wishing that she had been brave enough to try it earlier since she and her aunt are now planning to do more of their own cooking. I was familiar with tamales as a kid, but not for breakfast, although I like the idea.
The book is currently available online through Internet Archive.
#5 The Case of the Cool-Itch Kid by Patricia Reilly Giff, 1989.
#4 The Powder Puff Puzzle by Patricia Reilly Giff, 1987.
With the help of her friends, especially Jason, Dawn uses what she knows to put together a picture of the person they’re looking for, and they try to retrace her steps through town. Can they track down Powder Puff and get him back?
#3 The Secret at the Polk Street School by Patricia Reilly Giff, 1987.

The Secret of the Strawbridge Place by Helen Pierce Jacob, 1976.
Oscar, a boy visiting his grandfather nearby, becomes Kate’s friend. Since he was also injured in one of Josh’s escapades (having broken his leg when the kids were fooling around in the haymow), she invites him to join her in the search for the secret. They form a partnership called Cripples Incorporated and have fun inventing code words and writing secret messages about what they’ve discovered. Pursuing the secret comes with some risks, and before Kate can discover the whole truth about Strawbridge Place, she has a serious brush with danger.
The Case of the Wandering Werewolf by Drew Stevenson, 1987.
The monster hunt becomes more complicated when Bucky Bovine, a bully at their school, seems determined to stop them from going to Lost Woods to look for the monster. Does Bucky know something about the beast, or could he even be the monster himself?
Meg’s Uncle Hal takes her and her best friend, Kerry, with him on vacation to Merrybones, Maine. He has a cabin there, and it’s a good place to go fishing or exploring in the woods. However, Uncle Hal isn’t just there to relax this time. His friend, Emily Hawthorne, has asked for his help because she’s received some mysterious, disturbing messages.
She has returned to Merrybones to teach in the local school, but people in this town look at her as an outsider because she has spent so many years away. Now, she has received threatening messages written in rhyme and signed with a star with the number 13 inside. Her pet black cat, Melissa, has also mysteriously disappeared, and Emily is worried about her.
Ms. Lensky, the cafeteria lady at Gwen and Jill’s school, is just plain mean. All of the food that the cafeteria serves is yucky, even though the cafeteria is new. There will be a party to celebrate the opening of the new cafeteria, and even the kids’ parents and the mayor are invited. Gwen and Jill are happy because their class will get to help decorate the cake. However, Ms. Lensky, the M.C.L. (Mean Cafeteria Lady), doesn’t like the girls, and she blames them for a number of accidents that happen in the cafeteria.

Mandie and the Secret Tunnel by Lois Gladys Leppard, 1983.
#5 The Mystery Off Glen Road by Julie Campbell, 1956.