Times and Tides

While vacationing on a cruize ship a CIA analyst is called to the captains office and told that he has been personally asked for by the President of the United States. But that isn't the surpzing thing. WHat is surprizing is that the President who is calling him is doing so from fifty years in the future.

From there he must verify that the person on the radio is who they claim to be and then what he should do with her request. To find and deal with a young boy who will become dangerous. Assuming he believes her.