In The Gentleman's Guide to Vice and Virtue, Mackenzi Lee takes us on a high-seas tale with Monty, a bisexual British lord in the 18th century who embarks on a grand tour of Europe. He brings his best friend and crush Percy, who has epilepsy, along, hoping the trip will be a romantic getaway. Instead, a poor decision by Monty turns their trip into an adventurous manhunt that makes him question everything he knows about their relationship.