It's their only other title by Gilman and it's been over a month, so people might have missed the previous freebie and be willing to splurge now that HH is apparently out of KDP Select and thus unlikely to be freebied again or be "free" via the Prime Lending Library.
It may not be the most intuitive marketing move, but it does make sense. "Missed it earlier? Catch up for for a discount price!" Although I'd have expected it to go for a greater discount (50% off or more) in consideration of the recent offer.
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