From today, Doc Mortis – the monstrous villain from the fourth Invisible Fiends book – will be on hand to answer any questions you might like to ask him. He’ll listen to your problems and offer his unique brand of advice, so feel free to ask any questions in the comments below, on Twitter using the #AskDocMortis hashtag, or on this Facebook status.

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Doc Mortis, what food do you suggest I bring to the Teddy Bears picnic?
Tongue. Specifically yours. Yummy yummy, yes?
Hey Doc, me and my girlfriend recently split up, what shall I do??
Do not worry, my friend. There are being plenty more fish in the sea, yes? Unt like fish, you must gut them and skin them and slice them into fillets!