Single crime writer Tom Clempner receives a delivery of goods that he did not order. Out of the box emerges a domestic robot called Graumer, whose pleasant female voice reveals it to be the latest ultra-de-luxe model. The sender's address, the agency for the placement and rental of domestic staff, does not mention delivery to Clempner, so the robot suggests that he should just keep it. As it costs him nothing, the writer quickly overcomes his reservations and makes diligent use of the unforeseen help, perfect in conversation and housework. However, it doesn't take long before the man of the house becomes annoyed by Graumer's all-encompassing care. The robot has already become indispensable, be it in the construction of Tom's new mystery plot or the preparation of the upcoming dinner for some acquaintances. But why does Graumer seem so disturbed when he learns that a police inspector will be among the guests?