The Mephisto Swamp Mystery

Trapped in a swamp. Hunted by a gang. Armed only with courage and cunning.

When identical twin brothers Dan and Paul Case set off on a canoe trip into the eerie Mephisto Swamp, they're expecting a quiet escape filled with fishing, nostalgia, and memories of their late father. But their journey turns into a deadly adventure when they stumble upon an abandoned sawmill — ground zero for a dangerous counterfeiting ring run by a criminal mastermind known only as the Professor.

Captured and thrown into a harrowing game of survival, Dan and Paul must outwit armed thugs, navigate treacherous swamplands, escape quicksand, and expose a multi-state criminal operation — armed with nothing but their bond as brothers and the grit to stay alive.

Filled with non-stop suspense, tight pacing, and a strong dose of character-driven storytelling, the fourth entry of the Case Twins series is a thrilling young adult adventure perfect for fans of Hardy Boys, Stranger Things, and classic pulp fiction.