Breakdown. Jim Nash Adventures, #20

Jim Nash and his partner's faithful dog Friday are left to fend for themselves when Maddie Spence is called home. A concerned client lands on their second-floor doorstep, convinced his wife has gone missing. The police won't get involved. It's too soon, and the wife hasn't been gone long enough. Friday takes matters into his own hands when he chooses to babysit the man's young daughter while Jim handles business.
Is the woman really missing, or has her husband contrived an elaborate plan to cover up something more sinister?