When an intruder sneaks into a Victorian house that is being renovated and begins stripping off the wallpaper in the parlor, the three cousins help the owner investigate.
When Timothy and his cousins go to the church swap meet, they discover a thief has stolen the white elephant they plan to buy, and it's up to them to find the culprit.
Excited at the prospect of meeting Timothy's Native American pen pal at an All-Tribes Powwow, the three cousins soon find themselves involved in another investigation when they discover a thief in their midst.
Titus and his cousins are taking care of their neighbors' crabby Yorkshire terrier when the dog suddenly becomes sweet-tempered and the cousins have a mystery on their hands.