Willa and Ben must find out who is poisoning the Starlings' new horse, Buttercup, before it is too late.
- ISBN10 0606371273
- ISBN13 9780606371278
- Publish Date 24 July 2015 (first published 16 June 2015)
- Publish Status Out of Print
- Out of Print 6 April 2021
- Imprint Turtleback Books
- Edition Bound for Schools & Libraries ed.
- Format Hardcover (Library Binding)
- Pages 128
- Language English