Maid for the Mermen (Mermen 1) by Ashlynn Monroe

Couch surfing and temp jobs were a way of life for Daisy Daniels after she aged out of the foster care system. She’s always taken life one day at a time and gone with the flow. What she never expected is that flow would lead her down a raging current of uncertainty about her life and the world she knows.
River, Ocean, and Bayou Waterson need someone to keep their island home neat and tidy, but they have a problem. They can’t trust any old cleaning service. They need to find someone who will be willing to overlook their differences. What they never expected was to find a live-in maid they would all love.

When Daisy discovers the celebrity treasure hunters are really mermen, will she be able to keep her head above water? An ancient prophecy brings danger to their doorstep. Forces she never imagined are conspiring to destroy everything that matters to her. The only thing that can save her is a bond she can’t break. Saving the world definitely wasn’t in the job description.