Sirius

The terrifying noise fills each insane prisoner with an energy they have no way of using. It echoes off the walls; it will leave any sane person scarred for life – whether they are a visitor or a wrongly captured criminal.

Sirius Black is innocent.

And yet he suffers. He is forced to listen to his deranged cousin's laughter and screams. He knows she is lost – she has been lost for many years, now.

Then there is dear Bella's husband. Though not quite as demented as she – odd, Sirius thinks, when she is in love with another – he has often heard deep, throaty chuckles from the cell – or perhaps cage is a better word – so close to his own.

Other Death Eaters shriek and snigger throughout the days and nights they endure in the prison. It is known that nearly every single one of them has given up hope.

Perhaps the reason Bellatrix is still alive is because of the faith she has in the man – the one who made her become lost, who took her away – she yells will return.

These are the cackles of the mad.

And there is no way for the innocent to escape them.