When Jonah and Raff wake up on Monday, their mother Lucy isn't there. Although he's only nine, Jonah knows enough about the world to keep her absence a secret. If anyone found out she'd left them alone, who knows what could happen to him and his little brother? As the days go on, he puzzles over the clues left behind: who sent Lucy flowers? Why is her phone in a plant pot? Why are all her shoes still there? And who in their neighbourhood might know more about Lucy than he does?