The Meg Mackintosh Solve It Yourself Mysteries 6 Books Set by Lucinda Landon is a vintage collection of trade paperbacks published in the 1980s by Secret Passage Press. The series, aimed at young adults ages 9-12, features a series of mystery novels where the reader is encouraged to solve the mysteries themselves. The set includes all six books in the Meg Mackintosh series, providing a captivating and engaging reading experience for young mystery enthusiasts. With engaging storytelling and a focus on problem-solving, this box set is sure to keep readers entertained and entertained for hours. Books 3, 4, 6, 7, 8, and 10.