The premier of the "People's Republic", with some very valuable information, wants to defect to the US. The Seaview is sent to pick him up, but Nelson must first evaluate the information before deciding if the mission worth the risk.

The Seaview is sent to investigate the wreck of the submarine Angler. They uncover evidence of strange behavior minutes before the loss, and Nelson sees this change in behavior as the secret to unlocking what happened to the Angler.