Coming out of the garda training college in Templemore in 1985, Pat Marry only wanted to be a detective, but he had no idea of how to become one.  He ended up in the force for over three decades, and was instrumental in solving dozens of serious cases, including many murders.

In The Making of a Detective Pat Marry reveals the inside story of high profile investigations he led, such as the murders of Rachel Calally by her husband Joe O'Reilly. He also recounts detail of cases such as the 1990 murder of Marilyn Rynn, which involved the first use of DNA evidence to solve a crime in Ireland.

Or the 2001 murder of Mary Gough by her husband Colin Whelan, a case that was resolved largely through a painstaking trawl through Whelan's internet use - something that was new at the time.

He shared his story with Ivan on the Hard Shoulder.