The rising action in 'Alone' by Lisa Gardner is conveyed mainly through questions and suspense, but then weakens a bit as sharp readers will probably guess too early about the roles of the main characters. Bobby Dodge observes a potentially lethal hostage taking situation develop and deteriorate down the sights of his rifle. He is a state trooper who is aware that his role is crucial in a live or die situation. The rising action shows that the minute he pulls that trigger, shooting dead a shooter holding his own family hostage, he knows he probably will be next. So suspense is a key feature of the rising action.
Enter Detective Warren and her investigation into the shooting. So the rising actioon has 'human interest' - a detective who may be perceived as 'vulnerable' and sweet due to her feminine status. Her questions lead to the pretty widow, Catherine Gagnon, and into a murky and questionable past life of her family's elite but dubious background. The action rises again as readers are gripped by the unfolding page turning events. The rising action starts to climb towards a climax as the bodies begin to mount up. When a killer with evil vengeance on his mind is newly released from jail, the action rises even more in terms of suspense as readers sense that now everyone must watch as no-one is safe.