From the author of Murder Most Unladylike.

Daisy Wells and Hazel Wong are taking a holiday on the world-famous Orient Express - and it's clear that each of their fellow first-class passengers has something to hide. Even more intriguing: there is rumour of a spy in their midst.

Then, during dinner, there is a scream from inside one of the cabins. When the door is broken down, a passenger is found murdered, her stunning ruby necklace gone. But the killer has vanished - as if into thin air.

Daisy and Hazel are faced with their first ever locked-room mystery - and with competition from several other sleuths, who are just as determined to crack the case.

Daisy's eyes lit up. 'Oh, Hazel, we are up against an extremely cunning murderer - a worthy opponent for our third case! I have the feeling that this may be the Detective Society's most exciting adventure yet!'

Daisy Wells and Hazel Wong are taking a holiday on the famous Orient Express. From the moment the girls step aboard, it's clear that everyone in the first-class carriage has something to hide.

Then there is a scream from one of the cabins, and a wealthy heiress is found dead. But the killer has vanished - as if into thin air . . .

Daisy and Hazel are faced with their first locked-room mystery - and with competition from several other sleuths, who are just as determined to crack the case.