While visiting Paris, France, Reeya Rai buys a piece of art that leads her on a hunt for emerald glasses belonging to Shah Jahan in the 1600s. Her search leads her and her friends to a safe in a castle in the French countryside, but the key is nowhere to be found. Can a homemade stethoscope hold the answer to opening the safe? And will Reeya discover the treasured glasses within?

Reeya Rai and her friend Finlay join their archaeologist parents as they excavate an ancient Portuguese trading ship discovered on the Skeleton Coast of Namibia. Her dad believes the Fiery Cross of Goa may have been among the artefacts in the shipwreck. This seven-foot-tall cross is covered with precious gems! Will Reeya and her friends find the treasured cross? And if they do, how will they move such a large artefact without rival archaeologist Dr Acker and his irksome daughter, Elsie, learning about it?

Reeya Rai has joined her archaeologist parents on an excavation of an underground city in Turkey. There she learns the legend of an Indian inventor and his water clock cup. She also learns that Turkey is an earthquake hot spot. Worried that warning signals won’t make it to the archaeologists working in the underground city, Reeya builds a homemade seismograph. It's designed to indicate an oncoming earthquake for those working underground. Will Reeya’s invention keep her parents and others safe, and will they ever find the legendary cup?

Reeya Rai and her best friend Finlay are thrilled to learn about an emperor’s lost treasure during their archaeologist parents’ tour of Madagascar. Libertalia, a fabled lost pirate town believed to have been built in Madagascar, could be the treasure’s hiding spot. Before the group heads to explore a nature reserve in search of the pirate town, Reeya and friends create a spyglass to help direct their path. Will they find Libertalia? Will other treasure hunters beat them to it? Or is the whole thing just a legend?