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An explorer who fakes a claim of finding a sea passage to the North Pole uses sabotage and trickery involving small skull stones to keep from being exposed as a fraud. He is willing to commit murder if necessary.

A man who along with his wife wants to move back to the United States is targeted for murder so the would-be killers can take his mine. Sergeant Preston and King help fool the would-be killers into thinking the man is dead in order to trap them.

Sergeant Preston is on the hunt for an escaped killer whom Preston helped put behind bars. The killer mercilessly gunned down another mountie and friend of Preston's, and is out to kill Preston.

Two hold-up men - one wounded - force their company on an old ex-convict friend who is now going straight. They threaten to reveal his past to his young daughter unless he helps them by getting medical aid.

A man comes to the Yukon from England to have his young cousin, a boy, killed for the boy's estate, and is aided by three outlaws.

After critically wounding a young mountie, three outlaws steal his gear and supplies, including his uniform, allowing one of the criminals to pass himself off as a mountie.

The only witness to a prospector's death turns out to be his pet collie, whose behavior has become unpredictable, and is suspected of being to blame.