Episode 8 (S04E08)

Archie realizes he has some free time and takes it upon himself to spruce up a room for the nursery. Meanwhile, Lexie and Auntie Liz are on the hunt for the spirit of a deceased MacDonald. A sculptor named Andrew moves into Glenbogle as a new neighbor and has a rocky first encounter with Molly. It turns out the ghost is actually a private detective searching for Irene, sent by her spurned ex. After the detective's visit, Irene departs, leaving Duncan heartbroken.