Citations:casefic

Noun: "(countable, fandom slang) a fanfic, typically based on a mystery or procedural franchise, which focuses on the solving of a case"

 * 2013, Anne Jamison, Fic: Why Fanfiction Is Taking Over the World, unnumbered page::
 * There are excellent Sherlock fics that focus on mysteries—Verity Burns' “The Green Mile” is among the best known and most successful case fics, incorporating as it does a compelling plot and extensive deduction scenes while also exploring the relationship between Sherlock and John.
 * 2017, Lucy Baker, "What Does Gender Mean in Regendered Characters", thesis submitted to Griffith University, pages 249-250:
 * An AU genderswap casefic based loosely on AC Doyle's The Abbey Grange, and other stories.
 * 2017, Francesca Coppa, "Preface: One Pringle, One Dorito, One Oreo", in The Fanfiction Reader: Folk Tales for the Digital Age (ed. Francesca Coppa), page ix:
 * They'd rate a successful casefic, appreciate the attempt at kidfic, and give points for the clever use of vampires, soulbonding, wings, or tentacles.
 * 2017, Marianne Gunderson, "What is an omega? Rewriting sex and gender in omegaverse fanfiction", thesis submitted to the University of Oslo, page 23:
 * The story is also a ‘casefic’, i.e. a story which revolves around the investigation of a crime: someone have been poisoning and killing alphas, and the resolution to the investigation turns out to have potentially groundbreaking consequences for Sherlock’s future, as well as for omegas in general.
 * 2017, Marianne Gunderson, "What is an omega? Rewriting sex and gender in omegaverse fanfiction", thesis submitted to the University of Oslo, page 23:
 * The story is also a ‘casefic’, i.e. a story which revolves around the investigation of a crime: someone have been poisoning and killing alphas, and the resolution to the investigation turns out to have potentially groundbreaking consequences for Sherlock’s future, as well as for omegas in general.

Noun: "(uncountable, fandom slang) such fan fiction collectively"

 * 2020, Shannon Sauro, "Fan Fiction and Informal Language Learning", in The Handbook of Informal Language Learning (eds. Mark Dressman & Randall William Sadler), page 144:
 * Casefic tends to be found mainly in fandoms for media that rely on mysteries or problem-solving (e.g. the US television show X-Files).