Redemption. Downs Crime Mysteries, #11

Twin brothers on two sides of the world are kidnapped at the same time sparking investigations in both Cairns in Northern Queensland and Inverness in Scotland. Two police forces are joined in trying to solve the crime. During the investigation, Sarge (Detective Chief Inspector) Downs and his two colleagues discover that the supply and distribution of narcotics are involved and the twin brothers' business is not all that it seems to be.
Sarge and Detective Sergeant Liz Rhodes fly to Scotland to search for links in the chain of evidence. Their Scottish counterparts Donald McPherson and Amelia Campbell ably assist them and eventually they all fly back to Australia to try to prevent the possible death of one of the brothers. Just who the kidnapper is and what his motives are, remain a mystery until the very end.