Wedding fever has hit the O-brian family and death and chaos has followed. The day after Max and his friends fought the monstrous robots in 'Twisted Code' the group returns to their lives of semi-normality. Max and Ruby count down the days until their parents wedding and the end of their situationship.

But then suddenly an attack on the school and a death in the group scars everyone deeply. Their contact with X has been cut off and Max has been thrown into the deep end of his life as the Fourteenth Prime. Max and his friends have to learn to survive as the Shadow Cult closes in on them and the cult readies for the years one hundred sacrifices.

As tensions rise and the death toll gets high Max must finally accept his legacy to protect all that he loves but will that be enough or will a certain shadow come and swallow Max whole and put an end to the Primes forever.

Diamond Call is the third instalment in the Ember Knight Saga. It brings all that this trilogy has set up and brings this part of Max's life to a close in the only way it can.