That will end a 25-year career with New Zealand Police for the 48-year-old head of the Criminal Investigation Branch in Oamaru. He reckons he has spent 23 of those on call, being phoned at all hours of the day and night.
"It's been fun," he says about a career that he would recommend to anyone who wants to learn skills that are transportable to other careers.
But now he judges it is time for a change, and a change in lifestyle.
He came to Oamaru in 1997 as a detective and was appointed detective sergeant in 2000.
In his time in Oamaru, he has worked on some high-profile cases, including murders.
He refuses to pick the most memorable, wanting to respect the privacy and feelings of individuals and families involved; nor will he be drawn on the most unusual or humorous, for the same reasons.
But he admits he had a higher profile in Oamaru than he would have in cities, being in the spotlight as the lead detective in cases not being the most comfortable for him.
"There has been a huge array of cases," he said. "The best are those cases when people have been happy with the ending, but there have been others when there has not been [a good ending], because that is the nature of cases," he said.
One of the highlights had been the people he worked with, whom he described as dedicated and professional, showing great acts of bravery and unselfishness.
He has not faced any challenges he has not expected.
One of the first things he had to contend with when he came to Oamaru, after working in the greater Wellington area, was walking up to a house and seeing an open window, expecting that meant someone was at home and then finding the house empty.
Since then, society had changed significantly.
That had also led to more youth crime in Oamaru, which he described as "a major issue" but which he emphasised was caused by a minority.
Det Sgt Ryder intends to stay in Oamaru and has bought a small business.
He said it was a good place to raise a family and he wanted his children to complete their education in Oamaru, giving them a stable platform to end school.
"After that, who knows?" Det Sgt Ryder emigrated to New Zealand from Ireland in 1984. Two years later he joined the police force, enjoying working in small towns in the North Island before various stations in the greater Wellington area.
In 1994, he began training as a detective, looking for something to specialise in, and was attracted to CIB because it was a competitive and very rewarding career.
