San Francisco :, No Starch Press,, 
172 pages : chiefly color illustrations ; 25 cm.
"In this volume, our heroes Geo and Dr. Brain face hostile white blood cells, Phoebe's powerful heartbeat, and a bruise that threatens to suck them out of the bloodstream and leave them stranded forever! As you follow their fast-paced comic adventure through Phoebe's blood, heart, and lungs, you'll learn about the human circulatory system"--Unedited summary from book.