When Detective Murdoch (Yannick Bisson) investigates the abduction of Lucille Messing (Tori Anderson) a shy, churchgoing librarian, he's stunned to discover his former love, Anna Fulford (Lisa Faulkner), working at the library under an alias. Murdoch has grave fears for her safety since the Black Hand, a criminal syndicate responsible for murdering her fiancé, still has a price on her head. Realizing that Lucille's disappearance was not a case of mistaken identity, Anna believes that since she's already been in Toronto for months unnoticed, her life is no longer threatened. Goaded by a rival police inspector, Inspector Brackenreid (Thomas Craig) enlists Constable Crabtree (Johnny Harris), Higgins (Lachlan Murdoch) and the rest of the constabulary to form a baseball team. Meanwhile, Dr. Julia Ogden (Hélène Joy) finds herself in a jail cell at the station house after a scandalized citizen complains that she's teaching birth control to women. Though Murdoch's religious beliefs conflict with her progressive stance, he admires her sense of moral duty. Her husband, Dr. Darcy Garland (Jonathan Watton), does as well - up to a point. As Murdoch's investigation takes him into Toronto's sordid underbelly of gambling dens and brothels, Anna tags along, intrigued by the adventure. Slowly seduced by her warmth and curiosity, Murdoch accepts Anna's conviction she's safe - a belief they may soon come to regret.