Are you talking about "Seize the Day with Dietrick Bonhoeffer"?  This is a devotional book that mediates on a particular saying of Bonhoeffer combined with a Bible reading.  It is written by Dr Charles Ringma who is a Dutch-born Australian citizen  trained at the Reformed Theological College in Geelong and The  University of Queensland  Brisbane  Australia.

I see readers on Amazon give it a 4 1/2 star review, but the criticism I see of it is that it is more Charles Ringma than Bonheffer. 

Just wanted to point it out it is not a Bonhoeffer book per se.

Seems like it will have a more Reformed slant to it, but there is nothing that says you can't learn anything from the Reformed people--just be careful with the double predestination thing.

"Carpe Cyprinus carpio diem," which being translated is, "Seize the Carp of the Day ... "

Concordia, try 40-Day Journey with Dietrich Bonhoeffer. It's published by Augsburg Fortress, a Lutheran publisher. I've not used this one yet (it's in the queue), but I've used other 40 Day Journey devotionals, and have found them to very much have a Lutheran slant, and to challenge me to dig a little deeper both into Scripture and into where I am spiritually.

Here's the link at Amazon:

www.amazon.com/40-Day-Journey-Dietrich-B...