The thrilling inter-war mystery series.

It's Armistice Day in London, but enemy forces have infiltrated the bureau and sent Georgie's father into hiding. In danger herself, Georgie knows there's only one place where she'll be safe: Honeyfield. But with traitors in the bureau, she doesn't know who to trust. Can she get to Honeyfield before her father's enemies find her?

A devastating accident is only the start of Emily Mattison's troubles... When Emily Mattison falls victim to a near-fatal accident shortly after receiving an unexpected inheritance from a distant cousin, her ruthless nephew George seizes the opportunity to take control of his aunt's assets.

London, 1817. A man is shot outside of Covent Garden Theatre. Was Sir Roger Mellanby MP, a spearhead for social reform, really the intended target of the shooting? Twin detectives Paul and Peter Skillen are tasked to find the assassin.

Thea Slocombe is tired of having to entertain Drew's children, so she accepts a commission to watch over a house in Barnsley. However, her return to house-sitting is far from relaxing as on her first night she finds a fugitive woman hiding among some bushes...

1862. A goods train is going through the Sapperton Tunnel when it hits a makeshift pen of sheep inexplicably set up near the exit. The animals are slaughtered by the impact whilst the train hits a pile of rocks and is derailed, seriously injuring the occupants. Inspector Colbeck is called in to investigate.

1916: Bella is working as a Voluntary Aid driving ambulances in England when she gets engaged to Philip, on leave from fighting in France. His family strongly disapprove of her but the two of them are happy together. When the worst happens, Bella must manage on her own, though there are shocks and dangers she did not foresee ahead.