A dramatic story concerning Lady Helen Dudley Dearden who tries to protect her husband from a past relationship with a young woman. Robert Montgomery is a celebrated London Barrister who is about to be chosen as Attorney General and his wife Lady Helen is being blackmailed by Frank Lewis. Lewis demands £2000 from her stating that his wife has some love letters, which had been written by Sir Alan to her before he met lady Helen. Lewis arranges to meet Lady Helen in Dover and while there Lady Helen passes a gentleman on the cliff calling for Annie and telling Annie not to go too near the edge of the cliff. It transpires that the lady fell off the cliff and the man, her husband, is being tried for her murder. Sir Alan is to be the prosecutor for the crown and Lady Helen finds herself in a difficult situation as the witness that has not come forward. A baffling and exciting mystery, with a genius ending.