Bruce Cargo, a scientist at the British Geological Survey, is stunned when he discovers a journal purportedly written by Charles Darwin. But is the fantastical story it contains real, or is the journal just a hoax?

Bruce and his girlfriend Luna set out to determine the journal’s authenticity, but as soon as they begin, someone—or some thing—kills the Darwin expert they have just consulted and ransacks Luna’s apartment. A witness claims a “flying monster” was responsible, but the police are incredulous.

Meanwhile, Lily (Barnum’s Angel) in flashbacks to 1882, searches for a series of journals penned by Darwin that she hopes will help her find her brother—and deal with him when she does.

Now, more than a century later, Lily is well aware that the monster is her brother, Jamie. So as Bruce and the police pursue him, unknown to them, so does she.