book cover of The Rule of Threes
 

The Rule of Threes

(2026)
(The fifth book in the DCI Castle series)
A novel by

 
 
A protected witness who’s been given a new identity has gone missing. The original case involved William Redman and his South Manchester organised crime group. DCI Castle travels to a remote part of Scotland to make enquiries, and makes an arrest, but discovers he is also being targeted.

Are the two things connected?

Is Redman involved?

Rick is pushed to his limit, but is it enough?

 

The fifth book in the critically acclaimed DCI Castle series.


Genre: Mystery

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