Showing Devil's Waltz by Jonathan Kellerman

It's a living hell... Twenty-one-month-old Cassie Jones has spent most of her short life in and out of Paediatrics Hospital. Cassie is persistently, seriously ill and when no amount of testing can identify the cause, her doctor is lead to a disturbing diagnosis - Cassie's mother could be making her daughter deliberately sick. Child psychologist Alex Delaware is brought in to make an independent assessment of the Jones family. But Alex's attempts to find the answers and save a young girl's life will reveal a terrifying circle of corruption, abuse and murderous hatred.