https://www.abebooks.com/9780755473724/Diamond-Smugglers-Brooks-O-M-0755473728/plp
The Diamond Smugglers - Brooks, O. M.: 9780755473724 - AbeBooks
A whistled password puzzles three young inquisitive children who set out to create the Junior CIB, the New Zealand Criminal Investigation Bureau.
the diamondsmugglersbrooksabebooks