Childrens book

[Radgebint]

Does anybody know of the book where theres a blue monster that looks like a wave? that ate things, at one point it became a tunnel and just swallowed every car that drove in, but it had someone with it and they persuaded it to cough up everything it'd eaten or summat?

Not much to go on i know :)

[lilyfrog]

It is not the 13 1/2 lives of Captain Bluebear is it??