Taking down a Christchurch mass murderer - and how an Arabic-speaking Aussie rose above police racism to become the world's most sought after investigator. Don't miss the final part in our series with former NSW Police deputy commissioner Nick Kaldas.

New episodes of season 2 will be released exclusively on icatchkillers.com.au a week earlier than anywhere else. Subscribers to icatchkillers.com.au get exclusive access, as well as access to articles, videos of Gary's interviews and interactive content. 

See acast.com/privacy for privacy and opt-out information.