The Great and Terrible Quest by Margaret Lovett, 1970.
This story takes place in a fictional kingdom during the Middle Ages. Trad is a ten-year-old boy who has lived most of his life with his abusive grandfather. He barely remembers his parents, who died in a plague when he was only four. This grandfather consorts with robbers and evil men. Trad often pretends to be stupid to avoid their notice and warns travelers away from their territory.
One day, he rescues a man who has been badly wounded and cares for him in a secret cave. This man, whose white hair makes him seem elderly, insists that he is on a mission, a great and terrible quest . . . but because of a head wound, he can’t remember what his quest is. All that he knows is that time is short, and he does not have long to complete his quest to find something very important.
Trad soon learns that his grandfather’s wicked friends are the ones who attacked this mysterious stranger. Taking Trad’s father’s old lute, a couple of coins, and a mysterious ring dropped by one of the robbers which seems to have once belonged to the stranger, Trad and the stranger embark on a journey across the land, making friends and pursued by enemies as they go. While the stranger struggles to remember his identity and the nature of his mission, Trad begins to learn a few things about his own forgotten past and the nature of his family. Nothing is what it seems. Their country is in trouble because of the evil men who have been controlling it. Everything depends on the success of the stranger’s mission, and Trad has a much larger role to play than he had ever dreamed.
It’s a beautiful and fascinating story about good and evil, loyalty, friendship, and determination to do the right thing, even against the odds. There are parts that might frighten younger readers. The fights are violent and bloody, and there are a couple instances of cruelty to animals (partly, it seems, to show how truly evil Trad’s enemies are). Still, it’s a great story for tweens and teens, and readers will want to cheer Trad on as he struggles to help those around him and find his own destiny.
Although the kingdom is fictional and the themes are similar to fantasy stories, there is no actual magic in the story.
The book is currently available online through Internet Archive.
The Best Christmas Pageant Ever by Barbara Robinson, 1972.
Although the Herdmans don’t get the cake Charlie mentioned and have little interest in Jesus, they begin to be fascinated by the description of the pageant and decide to stick around. The Herdmans love movies, and the idea of being in any kind of play strikes them as fun. Although the Christmas pageant basically goes the same way every year, typically using the same kids for the same parts, once the Herdmans make up their minds that they want the starring roles, they manage to push and bully their way right into the center of everything.
At first, the more conservative adults in the church are horrified at the prospect of what the wild Herdmans might do on Christmas itself, but the minister and the lady overseeing the pageant decide to give the Herdmans a chance. As the title says, it ends up being The Best Christmas Pageant Ever as the Herdmans unexpectedly bring out parts of the Christmas story that the other people who had taken the story for granted hadn’t really thought about much: the simple human reactions of a poor young couple who were strangers in a new town, the fear and expectation that accompany doing something great but unfamiliar and confusing, and the sense of wonder and surprise that are at the heart of the Christmas season.
This Can’t Be Happening at MacDonald Hall by Gordon Korman, 1978.
Cranberry Thanksgiving by Wende and Harry Devlin, 1971.
The Talking Table Mystery by Georgess McHargue, 1977.
The Mystery at Fire Island by Hope Campbell, 1978.
The Treasure of Kilvarra by Elizabeth Baldwin Hazelton, 1974.
Without the amulet to protect her, Christie continues her search for the treasure. An accidental injury takes her to the place where it is hidden, but it’s a dangerous place. Caught in a terrible storm, the children explore an ancient stone tower. There, Christie sees the ghost of a long-dead monk, gesturing to her, begging her to follow him to the treasure that she seeks. The monk died protecting it, and it’s a very unexpected but wonderful treasure indeed. But, getting out of the place is going to be even more dangerous than getting in.

The Mystery Hideout by Ken Follett, 1976.
But, Izzie turns out to be a good friend for Mick. They both love to play soccer, and Izzie tells Mick that his father used to work in the old studio buildings that they’re tearing down to build the new hotel. In fact, Izzie even knows a secret way in, so the boys sneak in to explore a little. They’re goofing off with some of the props when they make the startling discovery that the prop guns are loaded with real bullets! Then, the boys have to make a run for it because there are other people sneaking around the old studios. What is going on there?
The Adventures of the Red Tape Gang by Joan Lowery Nixon, 1974.