Here's how the film is described at IMDB:
Last Fourth of July, teenager Christy Bruce disappeared from a high school beach party. Her severed arm washed ashore a day later. Drunken sea captain Blaise Shaw became a hero to the small seaside community of Harmony after killing the great white shark that was deemed responsible, but the Christy Bruce murder was no shark attack. Blaise turns to ghost hunter Ava Conte, who is skeptical but intrigued by his ghost shark ramblings. With preparations for a massive July 4th celebration rapidly approaching, they soon find themselves embroiled in a conspiracy of sex and murder involving the town's wealthiest and most powerful citizens. Unprepared to contend with a Ghost Shark that can hunt on land, sea, as well as anywhere there is enough water or rain to sustain its phantom form, Blaise and Ava must uncover the truth about the towns dark past or fall victim to the Ghost Shark. Written by Syfy
But that's not at all the plot of the finished film. There is no Christy Bruce character and Ava is not a ghost hunter, she's a teenager. Here's my plot description from Sunday's review:
Beyond the title character, the film's lead players are sisters Ava (Mackenzie Rosman, who played little Ruthie Camden on "7th Heaven") and Cicely (Sloane Coe) and their friend, Blaise (Dave Randolph-Mayhem Davis). The girls' father is killed in the initial Ghost Shark attack and they're the only ones at first who believe in Ghost Shark along with town drunk/lighthouse keeper Finch (Richard Moll, who played bailiff Bull on "Night Court").
I tried to get a Syfy publicist to explain the discrepancy but he never responded. "Ghost Shark" also contains an odd crediting. The credits on the screener I was sent say the film was written by Paul A. Birkett but then it also says it was "written and directed" by C.E. Furst.
This seems like an impossibility: How can one movie have two writers? My theory: Birkett took the first whack at the script and came up with the story that's described on the IMDB page; Furst re-conceived and re-wrote it into what actually happens in the completed film.