Question: What famous authors inspired two dark adventure movies featuring Hugh Jackman in the same year?

Context paragraphs:
Dark Adventure Radio Theatre: The Dunwich Horror: Dark Adventure Radio Theatre: The Dunwich Horror is a 2008 radio drama performed by the H. P. Lovecraft Historical Society, and based on the short story "The Dunwich Horror" by H. P. Lovecraft.  It is the second production in the Dark Adventure Radio Theatre series.  It is 75 minutes long.

Dark Adventure Radio Theatre: The Call of Cthulhu: Dark Adventure Radio Theatre: The Call of Cthulhu is a modern radio drama performed by the H. P. Lovecraft Historical Society, based on the short story "The Call of Cthulhu" by H. P. Lovecraft.  It is the fifth production in the Dark Adventure Radio Theatre series, released in November 2012.  As with other DART productions, it is 77 minutes long, the length of a standard audio CD.

Van Helsing (film): Van Helsing is a 2004 American dark fantasy action-adventure film written and directed by Stephen Sommers.  It stars Hugh Jackman as vigilante monster hunter Van Helsing, and Kate Beckinsale as Anna Valerious.  The film is an homage and tribute to the Universal Horror Monster films from the 1930s and '40s (also produced by Universal Studios which were in turn based on novels by Bram Stoker and Mary Shelley), of which Sommers is a fan.

Hugh Jackman: in Performance: Hugh Jackman: in Performance is a music concert by Australian actor, musician and dancer Hugh Jackman.

Hugh Jackman: in Concert: Hugh Jackman: in Concert is a music concert by Australian actor, musician and dancer Hugh Jackman.

Bayside Shakedown: Bayside Shakedown (踊る大捜査線 , Odoru Daisōsasen ) is a Japanese police drama/comedy series originally broadcast by the Fuji Television group in 1997.  The series was so popular that three TV movies, a stage play and six theatrical-release movies were made following the end of the TV series.  The first theatrical release was in 1998, the second in 2003, the third and fourth (spin-off movies featuring single characters from the franchise) in 2005, the fifth in 2010, the sixth and last released in 2012.

Dark Adventure Radio Theatre: Dark Adventure Radio Theatre is a series of radio dramas produced by the H. P. Lovecraft Historical Society.  They are produced in the style of 1930s radio drama, and the "Dark Adventure Radio Theatre" resembles a Mercury Theatre production hosted by the fictional "Chester Langfield" and "sponsored" by "Fleur-de-Lys Cigarettes".  However, the character "died" of emphysema after the fourth production ("The Shadow Over Innsmouth") and was replaced by the equally fictional "Erskine Blackwell," the new "sponsor" being "Forhan's Toothpaste."  In the latest production, "The Dreams in the Witch House", the sponsor became "Bub-L-Pep", a lithium-based drink.  The series features casts of professional actors and original music.  The CD releases include four prop documents, such as newspaper clippings, etc., from the show.

Niklas Sundin: Niklas Sundin (born 13 August 1974 in Sweden), is a musician best known as the guitarist of bands Dark Tranquillity and Laethora.  He is one of only two members (the other being drummer Anders Jivarp) to maintain a role as guitarist of Dark Tranquillity, unlike others in the band who have switched their roles or are not in the band anymore.  He also wrote some of the lyrics for the first three and recent two Dark Tranquillity albums (since "Projector" and until "Fiction" lead singer, Mikael Stanne, has written all of Dark Tranquillity's lyrics) and In Flames' album "The Jester Race", and continued to translate In Flames vocalist Anders Fridén's lyrics from Swedish to English for the next few albums while Anders worked to become more proficient in English.

Hugh Jackman: Back on Broadway: Hugh Jackman: Back on Broadway is a music concert by Australian actor, musician and dancer Hugh Jackman.  Jackman performs Broadway and Hollywood musical numbers backed by a 18-piece orchestra.

Van Helsing: The London Assignment: Van Helsing: The London Assignment is a 2004 animated film by Universal Studios Home Entertainment.  It features the voices of Hugh Jackman, Robbie Coltrane and David Wenham.  "The London Assignment" is an animated prequel to the 2004 motion picture "Van Helsing" (released the same year).  It tells of the events before the film.

Supporting paragraphs: Van Helsing: The London Assignment Van Helsing (film)
Answer: Bram Stoker and Mary Shelley