Karen McCombie 
You, Me and Thing 3: The Legend of the Loch Ness Lilo 

Ruby and Jackson get the surprise of their lives when they discover a Thing living at the bottom of their gardens. But Thing is cute and funny, even if sometimes, when he's upset, he gets a bit ARRGHH! And that's when the trouble starts. Like the time he goes to a pool party, and Ruby and Jackson find themselves face to face with an enormous inflatable monster…