The last book of the Seaward Isle Saga, Blood Mission, has a new cover:
Alex thwarts an assassination attempt on the life of her cousin, Prince Darin of the Water Elves. He assigns her a mission to find the assassin called a Blood Mission. Can she find him before he strikes again?
Link to Amazon: https://www.amazon.com/dp/B072HJB6QP/ref=sr_1_1?s=books&ie=UTF8&qid=1493388511&sr=1-1&keywords=joni+parker
Barnes and Noble: http://www.barnesandnoble.com/w/blood-mission-joni-parker/1117054055?ean=2940148822332
Print version: https://www.amazon.com/Blood-Mission-Seaward-Isle-Saga/dp/1502961849/ref=sr_1_7?s=books&ie=UTF8&qid=1493389181&sr=1-7&keywords=joni+parker