The Vatican has denounced as criminal" a new book of leaked internal documents that shed light on power struggles inside the Holy See and the thinking of its embattled top banker, and warned that it would take legal action against those responsible. Pope Benedict XVI has already appointed a commission of cardinals to investigate the "Vatileaks" scandal, which erupted earlier this year with the publication of leaked memos alleging corruption and mismanagement in Holy See affairs and internal squabbles over its efforts to comply with international anti-money laundering norms. The publication Saturday of His Holiness, by Italian journalist Gianluigi Nuzzi, added fuel to the fire, reproducing confidential letters and memos to and from Benedict and his personal secretary. The bank has been trying for some two years to remedy its reputation as a shady tax haven beset by scandals, which include the collapse of Italy's Banco Ambrosiano and the death of its head, Roberto Calvi, who also helped manage Vatican investments and was found hanging from London's Blackfriars Bridge in 1982.