Martin Clunes

DCI Colin Sutton is tasked with reviewing Operation Minstead, an 11-year inquiry to catch the "Night Stalker," a notorious serial rapist active in Southeast London. Colin questions the team's focus on DNA but also realizes how inadequate their resources are for an investigation of this scale. When an attack that fits a lot of the criteria is screened out, Colin's instincts yield a new lead.

Martin begins his journey in Sydney's iconic harbor, then travels to Lord Howe Island, where he learns about the Kentia palm, the world's most popular indoor plant. When visiting Norfolk Island, Martin learns the brutal truth about the most notorious prison island in the British Empire.

On Mundoo Island, Martin spends a day cattle herding; then he heads to Phillip Island, which boasts one of Australia's greatest conservation success stories, despite being a popular tourist destination. Martin also visits Maria Island and works with scientists to learn about the disease threatening Australia's iconic Tasmanian devil.

Sutton directs his team to prioritize the search for a white van, which he believes will lead them to the killer, but morale dwindles when the hunt proves daunting. Sutton's obsession with the case puts strain on his relationship with his wife when he decides to cancel on a family trip at the last minute.

Martin enjoys salsa dancing lessons and rum tasting in Puerto Rico before heading to the Sea Islands off the coast of Georgia, where the inhabitants attempt to preserve the traditional practices of African slaves. On the Outer Banks of North Carolina, Martin learns about the mysterious lost colony of Roanoke, before traveling to Chincoteague, Virginia, to watch the world-famous wild pony swim.

Martin begins his journey in Hawaii, the only US state made up entirely of islands. After leaving tourist-filled Oahu, he explores the active volcanoes of the Big Island, the largest island in all US territory, and the ancient traditions of Molokai Island. Next, Martin heads 2,500 miles north to Kodiak Island in Alaska, where there is one bear per square mile.

(Aired in US as The Apple Doesn't Fall) Louisa faints in front of her class, Aunt Joan nearly runs someone over with her car, and Portwenn's new policeman is falling asleep on the job.

A stomach bug sweeps through Portwenn. Martin creates mass panic by declaring it's the swimming pool, and then infuriates the locals by blaming the village water supply. Meanwhile, plumber Bert Large is making a mint off his new business: bottled water.

Aunt Joan's old flame arrives in Portwenn and rekindles their romance. Confidentiality prevents Martin from telling Joan about the man's health problem. And the doc has love problems of his own: a local teenager has a crush on him.

Doc Martin makes a bad impression on one Portwenn resident before he's officially hired. Things go downhill from there after he casts a pall over a local festival and gets punched in the nose.