Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Easy Money for Big Jack

The Keys of Hell was originally published in the 60s when Jack Higgins seemed to pump out the thrillers by the truckload under 14 different psuedonymns. According to the preamble at the start of this new edition, the publishers felt it was too good a story to languish out of print, so here it is, freshened up and available in the new millenium... There's almost nothing to like about this book. I give it half a star because Sean Dillon isn't in it and another half star for a vaguely exciting ending.