Multispectral signatures matching those of the Pleiades' spacecraft have been detected on three different Pacific islands. Ciara and her friends journey to these locations only to discover that they are interconnected by a wormhole, serving as a portal to Earth's twin planet.

However, this connection has become unstable, generating high-intensity gravity fields that result in space-time distortions. Ciara's life is threatened when she is transported back in time to be captured by the Taniwha, a supernatural being from Maori mythology.

Ciara's visions of her ancestor, 18th-century naval officer William Hartley, shed light on her own predicament. However, Hartley has been wrongfully accused of murdering Royal Society artist, Elliot Loundes. Unless the timeline can be restored, Ciara's existence will come to an abrupt end. Can she and her friends outsmart the Taniwha, rescue her ancestor from the gallows, and stabilize the wormhole? The task will demand a sacrifice that few would be willing to make.