Award-winning author Marianne Musgrove brings her light touch to a story of family, growing up and keeping secrets that is nailbiting and heartwarming in equal measure.

'I, Mackenzie Elizabeth Carew, do solemnly swear never to communicate anything about what happened tonight.'

That's what I promised my sister Tahlia, and I've tried my best to keep that promise. It's hard, though. Grandpa is acting so strangely since his accident. I'm sure Mrs B. suspects something, and Mahesh must think I'm weird for avoiding him. My best friend Annie is too busy hanging out with Regan and Tegan to notice. But someone will find out if we're not super careful. It's lucky Tahlia has a plan . . .