The Man Who Wasn't There is the first of the recently discovered Henrietta Hamilton mysteries to be published and is part of the Sally and Johnny Heldar mystery series.

People who get mixed up in murder cases must expect to be bothered.

And so it is for amateur sleuths Sally and Johnny Heldar late one evening. It seems cousin Tim has found himself in a bit of a pickle: his fiancée, Prue, has reneged on their engagement after becoming a suspect in the murder of her unlikeable employer.

Desperate to win her back, Tim pleads with the Heldars to help clear Prue's name. But Sally and Johnny find themselves perplexed by the Willow Walk murder. Filled with blackmail and plagiarism, wartime treachery and lying witnesses, the crime-solving duo have their work cut out for them.

But will they be able to help Prue... or is she more wrapped up in the case than Tim realised?