Recommendations based on "The Secret Seven Collection 3 Books 7-9"

'The Famous Five are excited to fill George's boat with food and blankets and spend the week on Kirrin Island, swimming and exploring. But when they discover a mysterious trunk has been smuggled onto the island, they realise an even bigger adventure lies ahead. And after they hear a child's scream in the middle of the night, they must find out--who else is there with them...and why?'--Back cover.

The Secret Seven are siblings Peter and Janet, and Jack, Barbara, Pam, Colin and George. Together they are The Secret Seven - ready to solve any mystery, any time - in Enid Blyton's classic series of 15 mystery novels. A big fight has broken out, and the Seven need to stop it before someone gets hurt. But is the fight all it appears to be? In addition to the Secret Seven novels, Enid Blyton wrote six short stories based on the characters which are published in The Secret Seven Short Story Collection (Hodder). The stories are also available in individual volumes, divided into chapters to make them ideal for newly confident readers. They have been illustrated in full colour by Tony Ross.