Couples are being abducted and locked up together without access to food or water but with a gun and one bullet. The choice is stark - kill or be killed. 
 Eeny Meeny ie decribed as a rocket-paced and electrifying serial-killer debut and it is certainly true that it rockets along at breakneck speed, helped I think by the structure of the book which is written in very short, sharp chapters which jump from character points of view at breakneck speed. This meant that I was able to read it quickly which added to the pace of it I think, and helped with the enjoyment; it is not an intellectual read but it is an enjoyable one. 
 I did get the sense that this novel is the vehicle for the introduction of DI Helen Grace and apparently there is a sequel published in September which sounds relatively soon for a new author so perhaps they were written together. Because of this, quite a lot of the other characters were apparently expendable in various ways, so I would be interested to see whether the series settles down and develops a bit more, or whether they are all like this. I did find this one an enjoyable read, but it was very light reading with not much substance; to continue with the series there would need to be a lot more to it for me.