The Countdown killer is book 4 in the fabulous Major Crimes Series.
I strongly recommend you read these in order – so The Echo Man / The Twenty / The Puppet Master and then this latest The Countdown Killer.
You will be so invested by the time you are mid way in the second book that your only option will be to binge this series in one go!
So if you have not yet read The Echo Man – save the misery and buy all four at the same time.
I will soon be checking out Sam’s standalone reads.
Click HERE to view this book on Waterstones.