Ariadne Oliver is a 8-book series with 8 released primary works first released in 1920 with contributions by Agatha Christie and Agata Kristi.
#1-12 of 11 in Parker Pyne
1934 • 1 Reader • 272 pages • 4
#32 of 45 in Hercule Poirot
1942 • 98 Readers • 343 pages • 3.8
#8 of 8 in Ariadne Oliver
1972 • 130 Readers • 228 pages • 3.4