In The Lake, Justin (Jordan Gavaris) returns from living abroad after a break-up with his long-term partner, in the hope of reconnecting with the biological daughter that he gave up for adoption in his teens. His plans to create new memories with his city-loving daughter Billie (Madison Shamoun) at the idyllic lake from his childhood go awry when he finds out his father left the family cottage to his picture-perfect stepsister, Maisy-May (Julia Stiles). Additional cast include Jon Dore (Funny As Hell, Humour Resources), Carolyn Scott (Pushing Tin, Goosebumps), Natalie Lisinka (Orphan Black, The Expanse), Travis Nelson (Tucker and Dale vs Evil) and Declan Whaley (Criminal Minds).

The Lake is produced by AMAZE, with Michael Souther and Teza Lawrence serving as executive producers for AMAZE (Carter, Call Me Fitz), and is written and executive produced by Julian Doucet (Killjoys, St Nickel). The Lake comes from Amazon Studios and is part of Prime Video's continued investment in Canada. The Lake is the fourth announced Canadian Amazon Original series following the revival of the sketch comedy The Kids in the Hall, docu-series All or Nothing: Toronto Maple Leafs, and comedy-variety series LOL: Last One Laughing Canada. Since 2015, Amazon Studios has filmed 24 Amazon Original series and films in Canada, including The Man in the High Castle and Upload in Vancouver, The Boys and The Expanse in Toronto, Tales from the Loop in Winnipeg, as well as parts of Tom Clancy's Jack Ryan and The Voyeurs in Montreal.