The Rule of Threes: 5 (The DCI Castle series)
The Rule of Threes
Overall Rating: 4.1 / 5 (average from multiple review sources, as of 1 May 2026)
Based on a total of 50,012 customer reviews from independent review platforms.
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The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
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pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Based on a total of 50,012 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Cheapest Price
2 - 4 working days
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£9.49
Delivery from £3.99
The Rule of Threes: 5 (The DCI Castle series)
Overall Rating: 2.4 / 5 (average from multiple review sources, as of 9 May 2026)
Based on a total of 47,062 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Based on a total of 47,062 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Cheapest Total Price
This title will be released on July 2, 2026. Pre-order now. Express Delivery available with Amazon Prime.
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£9.99
Delivery from £2.99
The Rule of Threes
Overall Rating: 4.5 / 5 (average from multiple review sources, as of 8 May 2026)
Based on a total of 5,439 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Based on a total of 5,439 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Cheapest Total Price
3-5 working days
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£9.99
Delivery from £2.99
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The Rule of Threes - Details
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We have found 3 prices for The Rule of Threes. Our price list is completely transparent with the cheapest listed first. Additional delivery costs may apply.
The Rule of Threes - Price Information
- Cheapest price: £9.49
- The cheapest price is offered by Whsmith.co.uk. You can order the product there.
- The price range for the product The Rule of Threes is €£9.49to €£9.99 with a total of 3 offers.
- Payment methods: The online shop Whsmith.co.uk supports: Visa, Mastercard
- Delivery: The shortest delivery time is 2 - 4 working days working days offered by Whsmith.co.uk.
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A high-stakes British crime thriller where a protected witness vanishes and the detective hunting her is already being tracked. In South Manchester, duty does not take days off. Days before his wedding, DCI Rick Castle is pulled into the one case he cannot refuse-finding a missing protected witness who could finally bring down an untouchable Mancunian crime lord. The trail leads him to the desolate Scottish Highlands and explodes into violence and conspiracy, revealing a suspected leak within the police.Cut off from support, and fearful he's being watched, Rick pushes on. But the closer Rick gets to the witness, the closer his family gets to danger, turning his obsessive investigation into a fight he cannot walk away from-and a battle for survival he may not win. If the case does not break him, they will go after the one thing that will. Rule of Threes is Book 5 in the DCI Castle series.Perfect for readers who love British police procedurals, relentless detectives, and gritty, high-sta
£9.49
2 - 4 working days
Whsmith.co.uk
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