The Voice is the Ventriloquist's Scarface - the Tower is Bledin Towers, a Gotham City apartment building.

Scarface's voice is guidance - he's a symbol under which some of " Bleedin' " Towers' residents've rallied, against the City's demolition plans. They've killed one Gotham cop and taken another hostage - Jim Gordon and others're outside while Batman's made his way in.

Issue #5 had Batman finding that the Ventriloquist wasn't from where Scarface was emanating - he was in the Tower, but his tongue was cut.

Someone else was speaking the gangster's words - not the Towers resident who was apparently his second, but that man's abused wife. She'd ended #5 killing her husband because Scarface told her to - and then turning to the hostage cop, who'd been restrained witness to the act.

#6 opened on Scarface's others rushing in: " What the hell happened here?! "

( She told them. )