
After Irina Spasky dies while saving Dan and Amy from the fire that Isabel Kabra set on their uncle's cabin, Dan and Amy decode the last words of Irina and that directs them to Pretoria, South Africa. When they venture into Pretoria, they are given a postcard that suggests a connection with Shaka. As they unravel the history of Shaka, they must penetrate the Tomas base, where they will find a very important clue. Then they encounter their fellow family, the Kabras. And the book then ends with a family secret.
Now, that is all that I will tell you for the rest will be full of action and suspense. The rest of the book is just building up to the very end where you will learn about Amy's and Dan's family branch. Though the book is quite an easy read, it contains several literary elements. For example, on page 2 of The Viper's Nest, it states, "Isabel Kabra had done it.She had burned down their house in Massachusetts all those years ago, and Dan and Amy's parents hadn't been able to escape all those years ago. Now Isabel was finishing her job." The last sentence was the key clue to tell that the Kabras will, again, try to kill Amy and Dan again in this book. I think that the author gave too much information in that sentence. If Peter Lerangis would have just said something like "And now she tried to burn Uncle Alistair's cabin" or something along that line, it wouldn't have told that much. But the fact that she said "finishing her job" established that the role of the Isabel Kabra is to kill or attempt to kill Dan and Amy.
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https://gatheringbooks.wordpress.com/2011/09/20/teaser-tuesday-2-graphic-novel-ya-love-and-poetry/