Notes

Science-obsessed Grace's fresh start with her dad in Devon is derailed when the smart speaker in their new house comes alive at midnight and says: "I'm going to murder you."

And after Grace begins to investigate, she uncovers four mysterious deaths, “all supposedly accidents“ that are linked to the device.

But only Grace knows that one of those deaths was actually a murder and now she must identify both the victim and the killer, using the methodology of a chemistry experiment before she ends up dead herself.