Reeya Rai and the Secret Workshop

While helping her parents organize items at a museum in Greece, Reeya Rai finds some paintings made by a medieval artist and inventor from India. When Reeya learns that artists sometimes hide secret messages in their paintings, Reeya creates a special colour-wheel to study the artist's paintings. In them, she finds clues to the location of the inventor's secret workshop! Unfortunately, to access it, Reeya needs a small artefact currently held by her nemesis, Elsie Acker. Will Reeya find a way to get the artefact from Elsie without alerting Dr Acker to the workshop's location?