A Clue in Code by Marilyn Singer, 1985.
This book is part of a series about a pair of twin boys, Sam and Dave Bean, who solve mysteries with their friends.
One day, the boys’ teacher, Ms. Corfein, has one of their classmates, Roger, collect money from the students for a class field trip. Ms. Corfien tells Roger to put the money in her locker, but later, the money is gone.
Anyone in the class could have taken it. When Dave went into the classroom to feed the class’s pet gerbil at lunchtime, he saw Willie, the class bully, there as well as his friend Patti, who thought that it was her turn to feed the gerbil. Of the two, Willie seems like the best suspect for the theft because he’s been in trouble before for stealing, but perhaps there was someone else in the room before any of them arrived.
Sam and Dave decide to begin their investigation with Willie. His father is the school’s custodian, and Willie has been using a copy of his father’s key to the school to sneak around after hours. To the twins’ surprise, when they confront Willie, not only does Willie deny stealing the money, but it turns out that he’s actually been scared and upset himself. After being caught stealing the last time, his parents have been especially strict with him, sending him to bed early, limiting his time with friends, and not allowing him to watch tv or read comic books. In fact, his father tried to get rid of his entire collection of comic books by throwing them in the trash, but Willie rescued them and has been hiding them in the school, sneaking away to read them when he can. However, someone has discovered them and stolen them. Willie wants his comic books back, but he can’t report them stolen because his father thinks that they’re already gone. Worse still, his parents will be even harder on him if he ends up taking the blame for stealing the class’s trip money.
In spite of Willie’s reputation, which he deserves, Sam and Dave think that he’s telling the truth about the thefts. Then, they happen to find a strange message that appears to be written in code after some of their classmates were throwing paper airplanes. With the help of Rita, a friend who is very good with codes, they decode the message and uncover a valuable clue that explains why the comic books were taken and leads them to the thief’s identity.
I was pretty sure, from the very first chapter, who had stolen the money, but I wasn’t completely sure of who had taken the comic books until the end. At first, I thought perhaps Willie’s father had found his stash and got rid of it again, but that wasn’t the case. The thief who took the comic books was the same person who took the trip money and for the same reason. This person’s father has been out of work, and they need the money. It turns out that Willie has a number of comic books that are now collectors’ items, and someone is willing to pay a lot of money for them.
The Return of the Plant That Ate Dirty Socks by Nancy McArthur, 1990.





The Twin in the Tavern by Barbara Brooks Wallace, 1993.
The Mystery of the Haunted Trail by Janet Lorimer, 1989.
Mystery of the Roman Ransom by Henry Winterfeld, 1971.
When they return to the slave dealer’s home, he is gone, and the place is boarded up. An elderly slave who was left behind said that all of the other slaves were sold, and then the dealer simply fled, abandoning him. He also says that there was someone else who had come to see the dealer, demanding that he hand over the slave called Udo (the one that the boys had already bought). This man was a former gladiator with only one eye, and he was very angry that Udo was gone. He swore that he would he would get Udo one way or another, dead or alive. He threatened the dealer, saying that he would return later and kill the dealer and all of his slaves if Udo was not among them then. The slave dealer, not knowing the names of the boys who had bought Udo or where he could be found and therefore unable to get Udo back, fled in fear of the former gladiator’s threats.
Detectives in Togas by Henry Winterfeld, 1956.
The next day, when the other boys arrive at school, they discover that their teacher has been attacked and robbed during the night. Worse still, when they go to Rufus’s house to visit him, they learn that someone has written “Caius is a dumbbell” on the side of the Temple of Minerva, which has been dedicated to the emperor. Defacing a temple is a crime, and soon Rufus is arrested and sent to prison (being young and part of an important family does not guarantee him special treatment). Rufus swears that he was not the one who defaced the temple, but who else could have done it?
Valentine Blues by Jeanne Betancourt, 1990.
Soup by Robert Newton Peck, 1974.
Some of the stories are laugh-out-loud funny, and some of them have kind of a moral lesson to them, like the time when Rob realized that he didn’t have the heart to lie to his mother even if it would allow him to escape punishment for talking back to the school nurse, the time when Soup and Rob tried to cheat Mr. Diskin out of some money so they would have enough to go to the movies but ended up feeling guilty, and how the boys made themselves sick by attempting to smoke cornsilk. Others are just stories of childhood events and friendship, like the story of how Rob and Soup played football and how Soup loaned Rob his new shoes when his were ruined. Even though Soup often got Rob into trouble, he really was a good friend and went out of his way to make Rob feel better when he needed it the most.
This Can’t Be Happening at MacDonald Hall by Gordon Korman, 1978.