Book excerpt: The sea almost killed them, and now it must lead them to the truth in this standalone middle-grade eco-mystery about twins lost on the high seas from the author of the bestselling novel The White Giraffe. Twelve-year-old Jess and Jude live a dream life on a battered old yacht, sailing from one exotic destination to the next with their guardian. But when he vanishes one night after an argument with a stranger, the twins are left alone, facing an incoming storm and an unknown enemy. Surviving at sea is just the start of an adventure that will take them an ocean away to the former home of their missing parents and pit them against one of the world’s most powerful men. How far do they dare go, and what will they risk, to find the truth about who they are really are? Wave Riders from Lauren St John is an exciting and compelling middle-grade tale of sailing, family, and identity.