Inner Circle Volumes

September/October 1971 (Cook IC-1)
Lemons Never Lie by Richard Stark
Three's A Crowd by Doris Miles Disney
Tenant For The Tomb by Anthony Gilbert

November/December 1971 (Cook IC-2)
Loophole by Arthur Maling
Rub-A-Dub-Dub by Robert L. Fish
Ominous Star by Rae Foley

March/April 1972 (Cook IC-3)
Bad Trip by Kelley Roos
The Elusive Mrs. Pollifax by Dorothy Gilman
Dead Aim by Collin Wilcox

July/August 1972 (Cook IC-4) (red cover)
Woman With a Gun by George Harmon Coxe
The Other Maritha by Constance Leonard
The Mirror of Hell by Leonard Holton

September/October 1972 (Cook IC-5)
Relentless by Brian Garfield
Take A Body by John Creasey
71 Hours by Michael Mason

November/December 1972 (Cook IC-6)
A Rabble Of Rebels by John Creasey as Gordon Ashe
Inspector Ghote Goes By Train by H.R.F. Keating
The Chickens In The Airshaft by Steve Franklin

January/February 1974 (Cook IC-13)
The Little Brothers by Dorothy Salisbury Davis
The Curious Affair Of The Third Dog by Patricia Moyes
The Locked Room by Maj Sjowall & Per Wahloo

March/April 1974 (Cook IC-14)
Peter's Pence by Jon Cleary
You Won't Let Me Finish by Joan Fleming
The Leavenworth Irregulars by William D. Blankenship

May/June 1974 (Cook IC-15)
In Connection With Kilshaw by Peter Driscoll
Bargain With Death by Hugh Pentecost
Ripley's Game by Patricia Highsmith

July/August 1974 (Cook IC-16)
The Man With Two Clocks by Whit Masterson
The Power Killers by Judson Philips
Meet A Dark Stranger by T.E. Huff

November/December 1974 (Cook IC-18)
Whitewater by Bill Knox
You're Never Too Old To Die by Arthur D. Goldstein
Mark One: The Dummy by John Ball

The Detective Book Club Inner Circle was a second series (though the books are the same in appearance as the regular volumes) begun in September 1971 and intended to be bimonthly, sending up to two books per month. 

The publication dates provided by Cook do not always reflect a regular bimonthly publication schedule, with some skipped months and a number of "double" months.