The Dark Stone from Mebara

Based on the mythology created by H.P. Lovecraft, The Dark Stone From Mebara is set in 1924 Massachusetts. 
Take on the roles of Arthur Pendleton owner of the Pendleton Detective Agency and his two employees – Detective Aloysius Monroe and Professor Webley. 
The team has come in to possession of an eerie black rock with strange properties. As they try to discover the stones cosmic origins, they find themselves battling against madness, vicious cultists, and unspeakable horrors!