By making the correct decisions, the reader assists the Three Investigators in solving a robbery at the strange Markels mansion.

By making the correct decisions, the reader assists the Three Investigators in locating both a missing dinosaur fossil and a college professor accused of attempted murder.

Dr. Homer Rhodes and his children, Simon and Thea, investigate mysterious happenings, a suspicious, tattooed giant, smugglers, and drug runners on an archaeological expedition to a Bronze Age shipwreck off the Turkish coast.

The reader's decisions will determine whether the Three Investigators will be able to solve the mystery of unexpected screams heard on a local amusement park ride.

By making the correct decisions, the reader assists the Three Investigators in defeating a killer cult, whose members have kidnapped a ransom victim to get their hands on a valuable statue.