Nancy Drew and Hardy Boys Be a Detective Mystery Stories #6: The Missing Money Mystery (1985)

This is basically a Choose Your Own Adventure Book but featuring Nancy and the Hardy Boys. They head to California to stay with the Blake family, who are friends of Frank and Joe's parents. Jill, their daughter, tells them that she saw someone steal something and run away and that the person kind of looked like their gardener. Nancy investigates the gardener, and the boys check out the chip. One ending has Nancy catch some robbers and lock them in the basement of the house until the cops arrive, while the boys find a silicone computer chip, spend the whole book trying to find who stole it, and finally learn that it's worthless. Another ending has Nancy find out that the gardener is innocent and saving the day because she's Nancy. As she and Jill float in the pool, Jill is super relieved that he's innocent. Nancy laughs about how the Hardy brothers once again followed the wrong lead. In another ending, both sides win. They actually work together to ...