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.
Please note this copy has some light scuffs on the edges of the covers and has purple sprayed page edges.
ISBN: 9780552570749
Size: Paperback, 288 pages
Publisher: Puffin
Published: 2015