Called Under - Nathan Haines - Bog

Joey's family stays at a cabin in the mountains every summer. This year, he gets to canoe all by himself, and the lake with the mysterious little island calls to him. But it's not shaping up to be a perfect vacation. Joey still has to look after his younger brothers and sister.
And not all calls should be answered.
Sometimes you end up over your head, and the stakes are as high as the water is deep...