The Home School Detectives ;

When Carlos and Julie Brown go to Mexico with their parents to help out at a village orphanage, Carlos investigates the ghost sightings, strange illness, thefts, and other mysterious events that threaten to close down the orphanage.

The Home School Detectives are glad to help members of the Springdale Community Church fix up a run-down apartment project, until Josh's new basketball disappears and Josh is suspected of taking a woman's purse.

While attending Camp Friendly Waters, Rebecca, Julie and Emily discover a cave with ancient Native American tools and weapons but, when they return to explore, the cave seems to have disappeared.

When Billy and his friends find a gold cup that has been missing for over thirty years, the Home School Detectives are thrown into their first cae.

When the Home School Detectives respond to an old woman's plea to help her find her dead husband's missing gold watch, they discover some mysterious activities at the nursing home where she lives.

While Josh, Billy, and Carlos are vacationing at Horseshoe Ranch, some of the other guests arouse their suspicions and eventually lead them to discover a ring of horse thieves.

When the Home School Detectives respond to the blond girl's request to help find her missing computer, they become involved in mysterious deceptions.

When Carlos and the others don't show up for ice cream, Julie and Emily start looking for them. Soon they find their friends abandoned bicycles and several small computer chips. When a strange man with a red beard show up, wanting to know everything about the chips, the mystery deepens.