The violent Hutch-Kinahan feud was one of the biggest challenges to police in the history of the Garda Siochana.
Relentless, financed by a billion euro cartel, and with hit teams using new means of plotting their kill it left its mark on the fabric of Ireland.
Now, journalists Stephen Breen and John Hand have penned a new book 'Kinahan Assassins'.
They join Nicola to discuss their detailed look at each incident, the killers, their many innocent victims and the Garda response to an unprecedented threat to the security of the state.
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