All the Myriad Ways
Detective-Lieutenant Gene Trimble faces an increasing number of bizarre suicides in a world struggling to come to terms with its place in a multiverse of different timelines, where every decision ever made by anyone becomes an alternate universe.
Niven's take on divergent timelines
Anthology, Worlds of Maybe, edited by Robert Silverberg, 1970; graphic, Psycho, November 1972 (as "All The Ways and Means to Die"); Graphic adaptation with Howard Chaykin in Unknown Worlds of Science Fiction #5, Marvel Comics, Sept. 1975, includes Niven interview; anthology, Galaxy: Thirty Years of Innovative Science Fiction, with memoir, cloth and paper, edited by Frederik Pohl, Martin H. Greenberg, and Joseph D. Olander, Playboy Press, 1980; anthology, The Way It Wasn't, ed. Martin H. Greenberg, Carol Publishing Group/Citadel Twilight 1996; anthology, The Best Alternate History Stories of the 20th Century, ed. Harry Turtledove & Martin H. Greenberg, Ballantine Del Rey, 2001; All the Myriad Ways; N-Space; Best of Larry Niven, The; De Stranden Van Serius Vier