Eldritch Affair of the Cosmic Ne'er-do-wells

In 19th-century England a secret order of wealthy businessmen and their inhuman allies prepare to summon a host of terrible, godlike beings into their reality, attaining godhood for themselves while dooming mankind, and it falls upon the five hardy, fearless friends known as the Roustabouts to prevent the summoning ritual and save the world - and more importantly, their local pub.