Former Boston Brahmin Mercy Allcutt is excited to be renting out suites of rooms to deserving working women in her new home on Bunker Hill in Los Angeles. She considers she's performing an act of good-heartedness, no matter skeptical her boss, private investigator Ernie Templeton, is about her endeavor.

When her housekeeper's son is arrested for the murder of a Hollywood big-wig, Mercy presses Ernie to solve the case. She's positive Calvin Buck is innocent. Ernie tells her he'll do his best. She's not entirely convinced he means it, so she does some snooping on her own.

In the meantime, Mercy not only takes driving lessons from Ernie, but she discovers there's more to being a landlady than meets the eye. Is one of her Angels of Mercy not what she appears to be? Only time, and perhaps Mercy and Ernie, will tell . . .