Barney has fallen behind with his rent and Aunt Barbara says he and Nev will be evicted unless the full arrears are paid. Barney gets hold of the money and gives it to Mr. Prank to pass on to Barbara but the nasty man hides it in a drawer, anticipating that he will get the better flat if Barbara evicts Barney and, best of all, he will be rid of Nev. He has,however reckoned without Crazy Keith's spy kit, which contains invisible ink and allows Nev to make himself invisible and recover the rent money.
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