Couples who kill share a little-understood condition that has been called folie a deux. In this first in-depth study, find out why the likes of Brady and Hindley, Fred and Rose West and many others lay dormant for so long before detonating with extreme sociopathic violence. They fantasise about murder most foul, sometimes lying dormant for decades. They are unable to carry their warped delusions into reality until they meet another such evil mind. The results are shocking. Christopher Berry-Dee takes the reader on a bleak journey, crossing the sea of shared madness to meet the couples who are in reality nothing more than killing machines. From the Belgian couple Michele and Marc Dutroux, to the unique triple acts of shared madness carried out by Kenneth Bianchi, Angelo Buono and Veronica Compton, each entry is a revealing study for all those with an interest in true crime and the psychopathic personality.