We know early on in The Angel of Terror who is willing to cause mayhem and why, so the question is can the responsible parties be brought to justice? Because the main villain is cold-blooded, extremely cunning, and possesses a cleverly evil mind.

Angel of Terror is not a very satisfying title, but it begins with excitement when James Meredith's death sentence is commuted to life in prison. The crime is the murder of Ferdinand Bulford, the reason for the jealousy of Bulford's behavior towards Jean Briggerland, Meredith's cousin and fiancée; it is remarkable how many couples in the novels of this era are engaged or marry their cousins. But I digress.

Meredith's friend Jack Glover, Rennett, Glover, and Simpson's junior partner has vowed to prove Meredith's innocence when he attempts to kidnap orphan Lydia Beale, who works as a fashion illustrator for a newspaper. Miss Beale is in dire financial straits, having voluntarily taken on the task of paying off her late father's huge debts, and has been tormented by a constant procession of subpoenas against her as a result - seventy-five in both previous years.

While they are taking her in a taxi from which she cannot escape, Glover and Rennett suddenly appear, rescue her and take her to Dulwich Grange, the home of senior partner Charles Rennett. There she is asked an astonishing question: would she be willing to marry Meredith, who is at large with the collusion of Glover and Bennett and is in the house? If she agrees, her husband will not bother her, she will be handed over and returned to prison, but she will receive £ 20,000 when the nuptials are done and £ 5,000 a year thereafter for the rest of her life. Meredith's reasons for wanting to go through such a marriage are strong, but it must take place the following Monday. Despite her financial difficulties, we have already learned that Miss Beale is not a gold digger, but a decent young woman, so the reader is not put off by her eventual agreement with the strange proposal.

And so Meredith and Miss Beale are married the next morning at Rennett's residence. Moments later, Jean Briggerland appears out of nowhere, and then Meredith finds herself in the garden, an apparent suicide.

Having made her will while in the house during the night, Miss Beale or rather Mrs. Meredith inherits her wealth but is in great danger as a consequence. Now it's the count-ho as the villains make one attempt after another to dispatch her.