Mike Mignola's B.P.R.D. Volume 10, issue 1-5, The warning
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Summary/Review:
The team tracks down the mysterious gentleman who's been appearing in Liz's visions, but soon find themselves in over their heads when old enemies-from the frog creatures, to the Black Flame, to the last denizens of Hyperborea-descend to lay waste to the world. B.P.R.D.: The Warning is the first of three explosive arcs pulling together threads from throughout the series-and leaving the B.P.R.D. and the world forever changed.