OK, I confess... I bought this book a few years ago, and it was NOT for my son... heehee !
One morning Wendy is walking into Bob's house and he is sitting there all sneezy and sniffly.
There is a lot of work to be done, but she wants him to take some rest.
She and the machines have a very busy working day but manage to bring things to a good end.
And on the last page... one of the machines is coming down with Bob's cold.

Isn't this cute ?

C

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there's actually an episode too