In "Mystery at Lake Placid" by Roy MacGregor, the story follows the Screech Owls, a preteen Canadian hockey team invited to play in an international peewee hockey tournament in Lake Placid, New York. The team consists of several key characters, including Travis Lindsay, a young winger with dreams of becoming an NHL player. As the team arrives in Lake Placid, they face various challenges and mysterious incidents, including disturbances at their hotel, a bully from a Toronto team, and equipment sabotage.
Travis and his teammates band together to uncover the culprit behind these incidents. While the story presents several red herrings, they eventually discover that the team's trainer, Mr. Dillinger, was responsible for sabotaging their star player, Sarah, in hopes of getting more playing time for his son, Derek.
Despite the initial shock of betrayal, the team forgives Mr. Dillinger and finds a way to come together and succeed in the tournament. For his role in solving the mystery and leading the team, Travis is named the team's associate captain by Coach Muck. The novel emphasizes themes of sportsmanship, teamwork, and forgiveness in the context of competitive youth hockey.