Brian M. Sammons presents seven Call of Cthulhu scenarios, all with mundane solutions...the simplest answer is usually the right answer. However, each also contains a Must-Have Mythos section that provides Mythos solutions to the investigation as well. 

Seven Modern-Era Adventures of Mystery and Death

• A Whole Pack of Trouble - a group of film students have gone missing while shooting a found-footage style movie over college break. 
• Eye of the Beholder - five days ago, a young woman disappeared while working on an art project.
• Frozen Footsteps - A Wendigo-obsessed professor heads off to Michigan's Upper Peninsula for some rare (for him) fieldwork and discovers far more than he bargained for.
• Dark and Deep - A snuff film is making the rounds in which a woman is mauled to death by a Deep One. Are the film's establishing shots enough to track down the lighthouse was filmed at and get to the bottom of things?
• Visions from Beyond - A late-night voicemail left by a friend/relative in need of immediate help followed by them not answering their phone 
• The Watchers - the investigators are contacted by a single woman who lives alone and is being watched by unknown people.
• A Cleansing Flame - Bodies are being discovered, burned to death, with no known fire starter/accelerant present.

These scenarios are supported by 8 handouts, 6 maps by Guillaume Tavernier, over 25 NPCs, and almost 10 monsters, a 7-page modern newspaper to mine for future scenario seeds (some of which reference past Stygian Fox titles, and 6 pre-generated investigators to get your group playing fast.