Paul frees a boa constrictor that Tom is looking after---hours before their mother's dinner party.
An extensive search begins after Paul gives away a coin that was in Tom's safekeeping.
Tom and Annie accompany Paul into a supposedly haunted house.
The twins try to catch the culprit who's been polluting the local pond with toxic waste.
After Paul returns a money clip he found, he becomes unsure if he's given it to the rightful owner.
Tom and Annie investigate when a woman develops an interest in Paul's photo negatives.
The twins investigate messages Paul claims to have received through his guitar amplifier.
Paul unwittingly creates an explosive substance while working on a cure for his hiccups.
Annie is determined to break a speed record for tricycles and enlists Tom's help in designing a winning trike.
Tom loses a model rocket in which he installed his father's valuable altimeter.
Part 1 of 3. During a visit to the Davidsons' ranch, the Edisons investigate the disappearance of a horse named Rescue.
Part 2 of 3. Tom gets information on the whereabouts of a missing horse.
Tom's search for a missing horse leads him to a harbor where a horse matching Rescue's description was seen being put on a ship bound for a foreign destination. read more