Invisible by James Patterson/David Ellis

Emmy Dockery knows she is right, although no one seems to believe her.  She is currently on leave from her job as a research analyst with the FBI.  It's compassionate leave as her sister was killed in a fire and Emmy is grieving her.  There is also the small matter of her boss trying to push her out after she refused his advances and the leave is all about that also. 

Emmy knows what no one else does; her sister's murder was no accident.  She uses her time off to research other arsons that started the same way and soon finds a horrific pattern.  There have been multiple cases over the past few years of fires that didn't fit the normal arson patterns but do fit each other in their particulars.  The victims all had a fire with the bedroom as the point of origin with an overturned candle the source.  All of the victims were lying in their beds. 

Emmy can't convince anyone at work so she decides to go about it another way.  She contacts her ex-fiance, Bookman, who is retired from his work as a highly regarded field agent.  Books left the FBI after Emmy cancelled their wedding and they haven't been in contact.  But she manages to convince him that she is right and he manages to convince the Director that there is something worth investigating and that he should head up a task force, one that has Emmy front and center.  Although they have discovered the pattern of the arsons, can they discover the man behind them before he kills again?

This novel is a fast-paced thriller that will keep the reader turning the pages.  I haven't read a Patterson novel in several years after he started collaborating with other authors and writing novels with short chapters.  But this novel reminded me of why Patterson is such a popular novelist.  The action is fast and furious and there are enough surprises and plot twists to keep things moving along at a fast pace.  This book is recommended for thriller readers.