Some mother-in-laws are hard. This one might be murder. Miyako suspects her mother-in-law is a murderer.

It’s not just a case of them rubbing each other up the wrong way – there is definitely something suspicious going on. But Miyako isn’t exactly what she seems either. Her husband has no idea about her past life as a secret agent.

When she decides to use her professional skills to investigate her mother-in-law, the delicate equilibrium of their lives is thrown wildly out of balance. Many decades later, in a future world where electronic communication has been irrevocably compromised, confidential messages must be delivered by trusted couriers like Mito. But one delivery pulls Mito into a conspiracy beyond his wildest imaginings, and forces him into a race against time to defeat a world-changing technological threat.