May 1425 should have been a lovely spring month with the hard, deadly winter behind. But a merchant has been murdered, and a mysterious letter he carried is missing, a letter valuable enough to kill for. Sir Law Kintour, still scrambling for a living in Perth, is forced by the ambitious Lord Sheriff of Perth to search for it — hurtling Sir Law into a mire of murder, double-dealing, and treason. Law faces his greatest challenge as he races to find the letter before someone else dies. Soon, not only his own life hangs in the balance, but the very fate of Scotland as well.