There's a wonderful review by Lee Finkelstein of The Case of the Diamond Shadow in November's issue of Reading Time, the journal of the Children's Book Council of Australia. Here's an extract:
'Sophie Masson has a captivating writing style. She is able to prolong the suspense while completely capturing the period and atmosphere of her story. The cover illustration immediately holds the reader's attention, promising a great yarn. Each scene is written with an eye to detail and a firm tongue in cheek. Subtle humour pervades the tale though it in no way impedes the momentum of the story. It's a great tale, full of action and an Agatha Christie style of intrigue, glamour and twisting plots that will keep the reader guessing right until the end. Highly reccomended for school and public libraries. "