her repeated lying has been compared to joran van der sloot.es killed her daughter. there's a book out right now "portrait of a monster." lisa and cole co-wrote the book. tell me about the research that went into putting this book together and bring us up to speed about the comparisons and challenges to casey anthony and joran van der sloot. >> well, this book is six years in the making. lisa started the book in april 2005. >> yeah. >> right after natalee disappeared and as we know, joran told lie after lie. he gave 16 different versions to the police. there were so many lies that they didn't find the body and became almost impossible to secure a conviction. he what i have been following in the casey anthony case, her lying and lying and lying and the amount of time it took to find the body made the prosecution there almost impossible as well. >> cole points out you dedicated a lot of your life to this story so far over the last six years. how difficult has it been for you to do this as a job, but also to break away and have some sort of a pers