Alien Apocalypse: Genesis

In book two of the series, following "The Storm", humanity is on a downward spiral. Leon and Elliott set out for the Coryton Refinery and discover the oil reserves needed to fight the alien moss are under the control of a gang of kidnappers. A botched rescue attempt nets only one captive, and she knows of a “safe zone” where Leon can recruit help to take over the refinery, but getting there could get them killed.