Back in the 18th century, a unique exhibit known as the bird from Ulieta Island disappeared under mysterious circumstances from the collection of the English naturalist and traveler Joseph Banks. More than two hundred years have passed. It would seem that everyone has forgotten about the disappearance of the mysterious bird. But why now the British scientist John Fitzgerald is offered huge money to find the missing pearl of Banks's collection? Nothing is known about the fate of the mysterious bird - except for fragmentary information connecting the story of its discovery and disappearance with the history of Banks' relationship with a young woman hiding under the name Miss Brown. Fitzgerald and his assistant, a student from Sweden, begin their search - and soon realize that several adventurers are following on their trail...