Imagine downtown Riverhead almost 100 years ago: Prohibition. The Great Depression. And the unsolved killing of a well-known and well-liked doctor who, according to legend and some locals, still haunts the streets.

Then imagine reliving the intrigue of old Riverhead by taking part in a walking tour this fall.

That 1930s history sets the spooky stage for the town’s first-ever haunted walking tour this October. “The Corn Doctor’s Last Ride” revisits the creepy tale of Henry Frank Tuthill, a Polish chiropodist who earned his nickname for treating corns on people’s feet.

An eccentric who sewed his personal fortune into the two overcoats he reportedly never took off because he didn’t trust banks, Tuthill was murdered in 1932 at age 62, according to local lore. No one was ever convicted in the killing, which made headlines across the country.

Stepping back into that eerie history, the Downtown Riverhead Business Improvement District has created a part-live theater, part-true-crime experience focusing on five locations in a nighttime walking tour that will bring the town’s bootleggers, rum-running, secrets, suspects, betrayal and murder back to life — stop by stop. Structured as one continuous play, the walking tour will focus on the Tuthill drama.

And there might even be an encounter with one of the two ghosts said to still roam downtown, according to organizers. A portrait of Lena Miller Benjamin, niece of Phoebe Jane Benjamin, a previous owner of the Benjamin House at East End Arts, was moved to the organization’s temporary office on Griffin Ave. while construction is underway on its Main Street buildings. Lena’s ghost apparently followed it. Wendy Weiss, vice president of the BID, said they think she turns the light in their storage room on and off.

“The walking tour will be the feeling that you get when you watch ‘Only Murders in the Building.’ The ghostly feel without being too scary,” explained Melissa Martin, executive director of the BID.

Collaborating with Long Island historian and costume designer Colette Gilbert McClain, actors will serve as theatrical storytellers along the history trail. Decked out in the fashions of the time, women will wear dresses and boas, while men will sport fedoras, striped suits and black-and-white spectator shoes as they sip from fake bottles of gin.

“They’ll also be weaving in 1930s jargon. Funny words like ‘moxie’ (meaning nerve or courage), ‘what a racket’ (a scheme or operation), ‘a pretty penny’ (a considerable amount of money) and ‘the whole kit and caboodle’ (meaning everything),” McClain said.

Two of the main Depression-era characters are a detective and his wife, who, in McClain’s words, “is a gossiper,” spreading whispered rumors around town.

“People forget that Riverhead was a happening place going back to the 17th and 18th centuries. We’re infusing curiosity into this event to bring a whole different level of experience and understanding,” McClain said. “It’s historical fiction. It’s all accurate, but we are taking liberty in the acting of it using period clothing and 1930s jargon.”

For the disquieted spirits in town, she added, “their story is unfinished. Maybe someone on the tours will solve the mystery.”

Immersive and interactive, it’s not solely a history walk. It’s more of a theatrical evening designed to bring history back from the dead. There will also be Instagram moments at each stop.

“We’ll encourage people to take photos and tag online at our stops,” Martin said.

The hope is that after the tour is over, dinner or ice cream might entice walkers to stay downtown.

“We’re different from every area on the North Fork. There’s great history and architecture here. We want to show Riverhead as a walkable area,” Martin said.

While teaching visitors about the town’s paranormal past, Weiss also hopes the walking tours will draw people to the area and encourage them to come back to Riverhead.

“We love the idea of bringing people here for something that’s really interesting that no other village in the area has, and they’ll see there’s a gallery to walk into or a restaurant to visit,” Weiss said.

Running about 90 minutes, with bites to eat halfway through — perhaps haunted-history-themed chocolates from North Fork Chocolate — organizers are keeping ticket prices low to encourage those interested in history and the unearthly to join the walk.

The tours will meet at the gazebo behind the Suffolk County Community College cafe at 5 p.m. and run Saturdays, Oct. 10, 17 and 24 — a prelude to Halloween. For families or groups, the first three tickets are $20 each, with the fourth ticket free.

“At that time in the fall, parents will be taking their kids to the pumpkin farms, and then after that they’ll want real theater and real entertainment,” McClain said.

Martin added that “5 p.m. will still be light for the first walking tour on October 10th, but by the last one it will be darker, creepier but cool.”

The tour is open to all ages, but it won’t cater to younger children. No one will be jumping out and yelling “boo!” from inside a costume to scare participants.

“I think the eeriness will appeal to adults and maybe older teens who like reading scary stories,” Martin said.

Focused on the north side of Main Street, walkers will pass the courthouse; the Long Island Rail Road station, where a man was hanged in the 1930s for killing his wife; the Suffolk County Historical Society building; the East End Arts buildings; and Tuthill’s old office.

“We want people to have fun!” Martin said.