'Kiall and Eena’s father has been thrown in prison for failure to repay merchants for goods lost in a series of disastrous shipwrecks. Desperate to save him, their only option is to go fortune-hunting in the rift caves – but they can’t afford a guide. Kiall decides to sneak onto a pirate ship and travel through the caves. If he can just steal gold from the pirates and bring it back, all will be saved …' (Publication summary)