Laura Norder has come to London seeking a future as a detective. Soon she finds herself involved in Inspector Murder's latest investigation, involving a missing man, a remote farm, and a steam-powered chicken.
The search for a stalker leads the Inspector and his colleagues onto a train from London, where Luc invents a new way of networking, Laura meets a Belgian detective, and Constance gets a little over-stimulated.
When the wealthy Lady Carrington reports that her cherished diamond tiara has been stolen, the Inspector spies an opportunity to make a name for himself. He and Laura rush to investigate, leaving Luc to enjoy a day out with Constance.
On the trail of a series of cryptic messages found all over London, the Inspector and his friends find themselves undercover at a circus, where there's a sinister plan afoot.
After an eventful trip to the theatre, the Inspector and Laura find themselves investigating the murky world of art forgeries. Meanwhile Luc indulges in his passion for collecting, and Constance has a quiet night in.
In the final episode of the series, the Inspector is on trial for murder. It's up to Laura to prove his innocence, but both of them have figures from their past to face before the final verdict can be given.
Holmes is missing. In his absence, Inspector Murder ought to be a success - but things haven't gone to plan. Laura, Luc and Constance set out to cheer him up in time for Christmas Day, but this may be one problem none of them can solve.