Lock and Mori, written by Heather W. Petty, is a young adult CSI read that both genders will enjoy.  James “Mori” Moriarty is a teen who has lost her mother to cancer and is basically in charge of protecting her brothers from their violent father.  Their father, who is a London cop, drinks too heavily because of the loss of his wife and takes his frustration with life out on his kids, especially Mori.  Mori has that oldest sibling stamina to handle her horrible home life while being a start student.  When she meets Sherlock Holmes, there is something about his aura that both provokes her and attracts her.  Circumstances put them together at Regent’s Park on an evening after the brutal murder of a schoolmate’s father.  Both Lock and Holmes discuss how botched the crime scene investigation seems to be going.  Intrigued, Lock challenges Mori to a game to figure out who committed the murder.  The only rule is that both people have to share their information with each other.  Lock is mysterious because of his brilliance and because he is not the narrator.  With the story coming from Mori’s point-of-view, this reader kept wondering if Petty would have Lock would upstage the protagonist by the end, because, after all, he is Sherlock Holmes.  But Mori will go all the way to the end to maintain her control and fight her own battles.  Readers on either side who want one to out-maneuver the other will not be disappointed with the finale.  The only criticism involves the short scenes of passion between the two.  One character is about to go into the scariest situation of her life yet body groping kisses must happen first.  It doesn’t ring true for these super smart kids.  Their attraction to each other would have had enough tension without them having to get into bed together, especially with all of the other mysterious plotting and violent nature of the storyline. Still, the mystical London setting keeps the hints of the original Sherlock Holmes novels around and introduces this next generation to their past success.  Recommended for high school libraries.