This is another Blake & Mortimer album. Set in the 1950s, while this is a standalone album, it does follow up some plot threads from the prior 2-part "Sarcophagi of the Sixth Continent", so readers are recommended to have read that one.
While published as the 11th volume, it's actually the 18th. It's the third album by the 'second team' doing albums after the death of B&M creator EP Jacobs. It's by Yves Sente & Andre Juillard. Cinebooks is publishing their 4 other albums previously.
In this album, Mortimer is recovering from the events of the previous adventure. He gets involved in an archaeological mystery in Africa that points to a possible early civilization of mankind! As always, Captain Blake is pulled in, and Orlik makes a return, along with some other characters from previous albums, including an early love interest of Mortimer. With this album, matters are put to rest.
3 more albums are planned for 2012, which includes another overlooked EP Jacobs album, and the most recent 2 Blake & Mortimer albums (by Van Hamme and others). That will leave 6 more albums that could be done in 2013 and 2014!