The Family Fang meets The Storied Life of A.J. Fikry in this literary mystery about a struggling book whose recently deceased grandfather, a famed mathematician, left behind a dangerous equation her to track downand protectbee others can get their hands on it.Just days after mathematician and family patriarch Isaac Severy dies of an apparent suicide, his adopted granddaughter Hazel, owner of a struggling Seattle bookstore, receives a letter from him by mail. In it, Isaac alludes to a secretive organization that is after his final bombshell equation, and he charges Hazel with safely delivering it to a trusted colleague. But first, she must find where the equation is hidden.While in Los Angeles Isaacs funeral, Hazel realizes shes not the only one searching his lifes work, and that the equations implications have potentially disastrous consequences the extended Severy family, a group of dysfunctional geniuses unmoored by the sudden death of their patriarch.As agents of an enigmatic compa shadow Isaacs favorite sona theoretical physicistand a longlost cousin mysteriously reappears in Los Angeles, the equation slips further from Hazels grasp. She must unravel a series of maddening clues hidden by Isaac inside one of her favorite novels, drawing her ever closer to his mathematical treasure. But when her efts fall short, she is ced to enlist the help of those with questionable motives.