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In the spring of 1920, teenaged siblings Rebecca and Doug MacKenzie continue their adventures on their uncle's ship, sailing through a typhoon into the Celebes Sea in pursuit of a missing "gyrolabe" which may be connected to the disappearance of their parents.
In the spring of 1920, teenaged siblings Rebecca and Doug MacKenzie continue their adventures on their uncle's ship, sailing through a typhoon into the Celebes Sea in pursuit of a missing "gyrolabe" which may be connected to the disappearance of their parents.