A look at Paper Chase, an introductory scenario designed to be run for only a single player. It features a mystery, a classic Lovecraftian horror, and is very light in combat.
You can buy the Starter Set PDF here: https://www.drivethrurpg.com/product/260810/Call-of-Cthulhu-Starter-Set?affiliate_id=1017650
Get the physical box set and PDF from Chaosium: https://www.chaosium.com/call-of-cthulhu-starter-set/
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Guest starring Jack the NPC