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In 2009, three days before Halloween, a grisly crime stunned the seaport town of Anacortes, Washington.

In 2009, three days before Halloween, a grisly crime stunned the seaport town of Anacortes, Washington.

In 2009, three days before Halloween, a grisly crime stunned the seaport town of Anacortes, Washington.

Mark was known as the dog whisperer of Anacortes.

Mark was known as the dog whisperer of Anacortes.

Mark was known as the dog whisperer of Anacortes.

They soon discovered a story tangled in obsession. Who was the hunter and who was the hunted? Follow and listen to Train to Kill, the dog trainer, the heiress, and the bodyguard on the free Odyssey app or wherever you get your podcasts.

They soon discovered a story tangled in obsession. Who was the hunter and who was the hunted? Follow and listen to Train to Kill, the dog trainer, the heiress, and the bodyguard on the free Odyssey app or wherever you get your podcasts.

They soon discovered a story tangled in obsession. Who was the hunter and who was the hunted? Follow and listen to Train to Kill, the dog trainer, the heiress, and the bodyguard on the free Odyssey app or wherever you get your podcasts.

Now streaming. Everyone who comes into this clinic is a mystery.

Now streaming. Everyone who comes into this clinic is a mystery.

Now streaming. Everyone who comes into this clinic is a mystery.

We don't know what we're looking for.

We don't know what we're looking for.

We don't know what we're looking for.

Their bodies are the scene of the crime. Their symptoms and history are clues.

Their bodies are the scene of the crime. Their symptoms and history are clues.

Their bodies are the scene of the crime. Their symptoms and history are clues.

You saved her life.

You saved her life.