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Part XXI: 2020 Annual
Part XXI: 2020 Annual is a 2020 book by John Lawrence, Leslie Charteris, Bob Byrne, David Marcum, Stephen Mason Merrill, Michael Mallory, Derrick Belanger, Denis Green, Mark Mower, Hugh Ashton, Geri Schear, Jayantika Ganguly, John Lawrence Toole, Peter Coe Verbica, Dick Gillman, Paula Hammond, Jane Rubino, and Arthur Hall and is book #21 in the MX New Sherlock Holmes Stories series.