The beloved of journalist Nat Kindle, who worked in Silicon Valley, died several years ago under mysterious circumstances. The police were never able to figure out whether it was a murder... But one day Nat, sitting in a cafe, receives a strange note, the author of which advises him to immediately go outside. And as soon as he leaves the premises, a monstrous explosion thunders in the cafe. The most amazing thing is that the warning is written... in the handwriting of his deceased beloved! Is she really alive? Why is she hiding? And most importantly, how did she know about the explosion in the cafe? Nat begins to ask questions. But the closer he gets to the truth, the more danger he exposes his own life...