Join Ava and Oliver as they journey to Hatchtopia for a magical fireworks display . . . only to find that the whole of the Hatchimals' world is suddenly frosty and cold!The fireworks display can't happen unless it's sunny. But with Wishing Star Waterfall frozen over, there's no way to wish away the snow! Where has all this wintery weather come from? And can Ava and Oliver find a way to melt the waterfall and wish the snow away?This book also contains exclusive collector cards!