After it has been sold to a new owner,a shyster and killer has stolen the property deed to a valuable mine and is using it for blackmail purposes. The former owner of the mine is framed for a murder, and his daughter and the new owner work to save him from the gallows.

Big Bill Branigan, one of the tough characters of London's Limehouse district, falls in love with Curlytop because of her sweet innocence. He leaves his sweetheart, Bessie, for her and resolves to go straight. When he sets out to find a job, the jealous Bessie gets Curlytop drunk and hacks off her long curls.

A séance proves a ghost compelled a spiritualist to kill his rich father.

Writer James Langham and his wealthy wife, Claudia, quarrel and are divorced. Claudia moves into a posh hotel and renews her acquaintance with Alphonse Marsac, an old European friend with an eye on her fortune. Alone in the family mansion, James goes to an agency and rents a "wife" to be his daytime companion and housekeeper.

Sinews of Steel is a 1927 American silent drama film directed by Frank O'Connor.