FIRSTLY: don’t touch the hands of your cuckoo-clock heart. SECONDLY: master your anger. THIRDLY: never, ever fall in love. For if you do, the hour hand will poke through your skin, your bones will shatter, and your heart will break once more. Mathias Malzieu’s The Boy with the Cuckoo-Clock Heart is a fantastical, wildly inventive tale of love and heartbreak.