When three bodies turn up in sinister circumstances on the RLS Legacy, Amelia is left to investigate it herself after the authorities refuse to take action. She calls on the aid of some trusted friends, but is she ready to face Crescentia's ruthless criminal underworld? And is her new relationship with Delbert Doppler strong enough to survive another life-or-death adventure?

Dr Doppler embarks on Amelia's flagship for a once-in-a-lifetime scientific mission, but the voyage of discovery is threatened when they find that a ruthless pirate is on the loose and wants Amelia to know about it. Amelia suspects the return of an old enemy from her past, but can Doppler get her to trust him with her fears? And what price is she willing to pay to do her duty?