Die Again is the 11th title in the Rizzoli and Isles series by Tess Gerritsen. This mystery features a dual story line that takes place in Africa and in Boston, Massachusetts. The mysteries are not simultaneous in their execution, although they are presented to the reader in alternating segments. Eventually, of course, the mystery of what occurred in Africa ties into and becomes part of the Boston murder. But figuring that out and tying them together proves to be tricky.