The resource description states that there are "thirty meditations and prayers", but there are only 23 chapters.
"This volume contains thirty meditations and prayers that Thomas à Kempis
used "in time of need for the refreshment of my heart when overcome by
weariness, or cast down by sorrow." Chapters include "Of Confidence of
Divine Mercy," "Of Being Thankful for Benefits," "On the Grief and
Weeping for Sins," and more."
http://www.logos.com/product/15483/the-works-of-thomas-a-kempis
I also checked out google books and there are only 23.
Should the item description be changed?