We know China's influence is growing in the Pacific, but exactly how it operates is often opaque. Now, Four Corners has uncovered a paper trail that reveals just how far Beijing is willing to go to keep its friends in power. Today, reporter Angus Grigg on how a Chinese-backed multi-million-dollar slush fund is ensuring the Solomon Islands prime minister, Manasseh Sogavare, hangs on.  Featured:  Angus Grigg, ABC Four Corners reporter