As a e-book you need to skip the first book (it's actually book 5 in the series) and go to the second book and start there (book 3 in the series). The last book is actually book 4 in the series. Great series, engaging, and plenty of laughs, sarcastic humor, sex, action, great characters.
What a Dragon Should Know is book 3 and about Gwenvael & Dagmar. The first part of the book is so so but has plenty of laughs, especially the way he teases her brothers who are ultra macho. She is a great strategist that even in her father's land that is dominated by the men, she is prized by her father and he takes her advice for most everything including battle plans. Gwenvael is the family whore that even his own siblings doubt he can follow order and complete the mission he's on without messing it up by sleeping with the wrong girl.
Book 4 is Last Dragon Standing, about Keita & Rognar. He's a Northlander & she's also the family whore or viper or spoiled brat. Plenty of laughs, some action, and lots of new characters.
Book 5 is The Dragon Who Loved Me is about Rhona, who raised her siblings & is a soldier, & Vigholf, another Northlander. It is packed with action, plenty of laughs, and the kids really make you wonder about what they're going to be like as adults considering what they can do now. The issues with Izzy & Eibhear are still happening.