Unable to stop herself from investigating another murder, Rachel Murdock gets plenty of help from Samantha, the cat who follows her wherever she goes; her much less adventurous sister Jennifer; and Lieutenant Mayhew, who is grateful to have another sharp mind on the case.

Miss Rachel, her sister, and her cat are watching with undisguised interest a bandy-legged man who is spying on a house across the street until a speeding black sedan runs him down. The sisters are curious to know why the man was murdered-and just as baffled about what happened to the mysterious tenants of the house, who disappear the next day.