So, this isn't exactly mythology-related, in so far as Greek and Roman, but perhaps it's close enough since it does take a bit from various cultures stories on the mermaid. Closest it comes to Greek mythology is the mention of Lily's skill at siren-singing. I could imagine Odysseus falling for a siren like her!
Though I purchased my copy of Debbie Herbert's Siren's Secret from the local pharmacy, you can also find it on Amazon for $3.82.
I should start by mentioning that I don't regularly read Harlequin romances or stories about mermaids, they don't really float my boat, but still felt a tug of interest when I saw the cover.
I can't wait to read Ms. Herbert's next novel and look forward to many more mermaid stories from her.