Strange things are happening in the Cape Cod sand dunes. There have been sightings of an unknown creature in the National Seashore, part African lion, part … something else?

Here is the classic Gothic mystery combining a lurking sense of danger in a strongly atmospheric setting, a Hound of the Baskervilles-style case involving the reawakening of an ancient family curse dating back to the whaling days of New Bedford, and a curse foretelling another death about to take place.

The first volume of the Captain Underhill radio mysteries, in which a detective duo on Cape Cod solves crimes.

It begins as static ... then, you hear a voice, desperate, frightened, coming from a shack in the Cape Cod dunes, broadcasting his story to anyone who might be listening. He tells an unbelievable tale of missing persons and an unseen enemy that may already have conquered us.

Is he insane? Is he deluded? And most terrifying of all, is he telling the truth?

About “The Final Case,” Doctor Scofield, Captain Underhill’s personal physician, comments, “A most interesting case study. It is both sad and ironic that the mental affliction Captain Underhill used to pretend to suffer from: that of being senile, was ultimately the very thing that laid him low. And yet, in the annals of crime solving, if this final case does nothing else, it proves the kind of natural-born sleuth my good friend, Waverly, was.”

Suspense thrillers from Cape Cod Radio Mystery Theatre.

Two little girls stand with their heads bowed in my living room. I’m told they’re my granddaughters. Daisy is nine, and Alice seven. Daisy is the spitting image of her mother. This is the first time I’ve met them since my daughter and I fell out after she married that waste of space, Vince. They’ve come to live with me because their mother — my daughter — was murdered. In her own home while they slept close by. I think Vince killed her. But the police can’t prove it. I’ve always known he was no good. He treated my daughter like dirt. I said he’d cheat on her — but she wouldn’t listen.

Lowen Ashleigh is a struggling writer on the brink of financial ruin when she accepts the job offer of a lifetime. Jeremy Crawford, husband of best-selling author Verity Crawford, has hired Lowen to complete the remaining books in a successful series his injured wife is unable to finish. Lowen arrives at the Crawford home, ready to sort through years of Verity's notes and outlines, hoping to find enough material to get her started. What Lowen doesn't expect to uncover in the chaotic office is an unfinished autobiography Verity never intended for anyone to read.

Who is Audrey Hoedemaker? It's a question her sister Maureen has heard more times than she can count, and she doesn't know what the short answer would be. Little sister, troubled teen, backpacker, musical theatre coach, con artist, childcare worker. Murderer. A tragic, traumatic childhood casts a long shadow on the Hoedemaker sisters. Maureen has worked hard to move beyond the violence of the past and build a good, honest life for herself. Audrey, however, just can't seem to do the same, careening from one state of chaos to another.

After the killing of a prominent mob lawyer, NYPD homicide detectives Jacob Jackson and Caitlin Grimes start receive chilling, written “rules” for how to commit the perfect murder. "Rule number one for the perfect murder: Evidence is your enemy. Leave none behind." Jackson (Reid Scott) and Grimes (Cobie Smulders) race to find the killer, setting them on a collision course with the city’s crime underbelly, and a perpetrator who seems happy to toy with them. “Rule number two. No crimes of passion. The perfect murder is always business, never pleasure.”

Kidnappers grabbed Jenna in broad daylight, right in front of her children and their horrified classmates. Her family was issued an insane ransom demand: $25 million in cash and jewels, payable by the end of the school day, otherwise they’ll never see her again. As Jenna’s mother scrambles to gather the money, detectives Mo Butler and George Ortega follow the trail of the kidnappers, which will lead them through a sordid landscape of jealous lovers, broken dreamers, and twisted schemers. But every second counts, and there’s one thing Jenna Wade doesn’t have: very much time.

Retired police captain Waverly Underhill and his sidekick, Doctor Scofield, unlock the enigma in two edge-of-your-seat thrillers. Heard on public radio, each is a contemporary tale in the classic tradition of The Shadow, with a full cast, original music, and sound effects.

Menacing mob enforcer, Ricky Rubusto, kidnaps pet and store mascot, Hercules, world’s largest captive lobster, holding it for ransom and threatening to devour it unless radio DJ, Molly Neptune, pays off her father’s gambling debt. Now Captain Underhill must save the lobster before it ‘sleeps with the fishes.’

Retired police captain Waverly Underhill and his sidekick, Doctor Scofield, uncoil the mystery in two chilling adventures. Heard on public radio, each is a contemporary tale in the classic tradition of The Shadow, with a full cast, original music, and sound effects.

The first volume of the Captain Underhill radio mysteries, in which a detective duo on Cape Cod solves crimes.

The first volume of the Captain Underhill radio mysteries, in which a detective duo on Cape Cod solves crimes.