"An absorbing and expanding mystery... ripe for a bookclub discussion"— First Clue"Propulsive and lush, Fixsen weaves an exquisitely gothic tale." — Jess Armstrong, USA Today bestselling author of The Curse of Penryth HallWalk carefully, lest you become a part of Dr. Burnett's collection…1826. Isobel Tait finds herself, by chance, staring at a tiny human heart floating in a jar. It should be of little consequence; Dr. Burnett is renowned for his collection of oddities and medical specimens, and this, a juvenile heart with a damaged mitral valve, is not the strangest thing on display. Except that the condition is rare, and that Isobel's young son, who has been missing for months, suffered from the ailment. A phantom pulse beats in Isobel's ears. She knows something here isn't right.Missing persons cases are all too common in Edinburgh, where people simply vanish like mist. But Burnett is obsessed with his specimens – how far would he go to acquire a new one? Determined to investigate, I