The Miscalculations of Lightning Girl
by Stacy McAnulty
A funny, honest middle-grade novel about a math prodigy with OCD learning that friendship can't be calculated.
The story
Twelve-year-old Lucy Callahan was struck by lightning at age eight and woke up a math savant — along with a case of germaphobia, intrusive thoughts, and a ritual of sitting-standing-sitting she can't shake. Homeschooled ever since, she's ready to skip middle school entirely and head for college. Her grandmother has other plans: one year in seventh grade, one friend, one activity, and one book that isn't a math textbook. In a school with lockers that need cleaning, a sick shelter dog that needs saving, a new friend whose loyalty wobbles at exactly the wrong moment, and a math teacher who knows more than he's letting on, Lucy learns that the most important problems in her life can't be solved with equations.
Age verdict
Best fit for 10-12. Works well for 9 with a patient reader and for 13 for readers who like quieter emotional stories.
Our take
balanced_quality
What stands out
Each audience's top 3 dimensions. Out of 30 scored per book.
Kids love
- Character voice Exceptional
pi digits, compulsive numbering, ritualized phrasing. Voice is identifiable across 300+ pages. Sits at/above: voice specificity rivals City Spies's five-voice differentiation; emotional authenticity matches Monster Calls.
- Heart-punch Exceptional
Comparable to A Monster Calls and Tristan Strong Punches a Hole in the Sky , triangulated — Lucy's emotional peaks (shelter-dog euthanasia threat, public math-class breakdown) land with equal authenticity. Animal control climax achieves vulnerability without performance. Sits at: equal emotional intensity to both 10-level anchors.
Parents love
- Emotional sophistication Exceptional
Comparable to A Monster Calls and Charlotte's Web , triangulated — Anxiety, loneliness, betrayal-ache, pre-grief (sick animal) held simultaneously without simplification. Lucy's emotional journey matches both anchors' complexity. Sits at: equal emotional sophistication; vulnerability is specific and unperformed.
- Writing quality Strong
Comparable to A Snicker of Magic and A Monster Calls , triangulated — Clean prose, precise emotional rendering, show-don't-tell interiority throughout. McAnulty's craft is quiet and assured. Sits below: emotional sophistication equivalent, but sentence-level musicality less pronounced than Snicker's rhythmic artistry.
Teachers love
- Empathy & self-awareness Exceptional
Comparable to A Monster Calls and Amal Unbound , triangulated — Readers live inside anxiety and OCD authentically. Lucy's vulnerability (silent in crisis, explicit when safe) models emotional honesty. Sits at/above: neurotypical-accessible, equally empathy-generating; perhaps more classroom-appropriate than Calls.
- Cross-curricular value Strong
four cross-curricular connections vs. Golem's seven-planes depth.
✓ Perfect for
- • Kids who love realistic fiction with big feelings
- • Math-curious readers and STEM-identified girls
- • Readers who see themselves in anxious, germaphobic, or ritual-bound narrators
- • Animal-rescue fans
- • Families looking for a gentle, respectful OCD representation
Not ideal for
Readers who want nonstop action, laugh-on-every-page humor, or a tidy feel-good story without any emotional bruising.
⚠ Heads up
At a glance
- Pages
- 304
- Chapters
- 47
- Words
- 50k
- Lexile
- 530L
- Difficulty
- Easy
- POV
- First Person
- Illustration
- None
- Published
- 2018
- Publisher
- Random House Books for Young Readers
Mood & style
You'll know it worked when…
Readers who connect with Lucy's voice in the first three chapters will finish; readers who want external plot momentum may drift in the middle.
More like this
Same genre, similar age range. Ranked by kid score.
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