All over the world, brutal attacks are crippling entire cities. Jackson Oz, a young biologist, watches the escalating events with an increasing sense of dread. When he witnesses a coordinated lion ambush in Africa, the enormity of the violence to come becomes terrifyingly clear. With the help of ecologist Chloe Tousignant, Oz races to warn world leaders before it is too late. The attacks are growing in ferocity, cunning, and planning, and soon there...

Dr. Dylan Reinhart wrote the book on criminal behavior. Literally -- he's a renowned, bestselling Ivy League expert on the subject. When a copy of his book turns up at a gruesome murder scene -- along with a threatening message from the killer -- it looks like someone has been taking notes. Elizabeth Needham is the headstrong and brilliant NYPD Detective in charge of the case who recruits Dylan to help investigate another souvenir left at the scene...