What is the best Michael morpurgo book?

I haven't read five, but Why the Whales Came is a good one. It's set on the Isles of Scilly just before WWI. I loved it. War Horse is good as well, it's about a horse called Joey and his experience through WWI mainly, but it goes through his life. Sort of like Black Beauty. It's recently been made into a play. The erfly Lion is awesome. It was my favourite book when I was young.