The Cartographers by Peng Shepherd

A love of mapmaking brings together a group of college graduates for a summer project that will change their lives forever. They have been friends forever with four of them becoming couples and one baby. It seemed like the idyllic time until an accident took a life and pulled them apart. Fast forward and the baby is grown following in her parent's footsteps with a career in cartography. When Nell discovers a secret map in her father's desk at the New York Public Library after his death she is pulled into a very dangerous hunt. With one step down the rabbit hole searching for the map's purpose she sets off a chain of events that will affect everyone she loves. A mastermind of Indiana Jones meets Brigadoon - this is one treasure hunt that will have you seeing maps in a whole new light. A must read for old school librarians, armchair adventurers and treasure hunters of all ages.  5 stars