These four books are all in the same series by Anne McCaffrey.
56. Freedom's Landing
57. Freedom's Choice
58. Freedom's Challenge
59. Freedom's Ransom
"You take turns, advise and protect one another, even heal or be healed when the going gets too tough. I know! That's not a game--that's friendship!" ~Shelly Mezzanoble,
Confessions of a Part-Time Sorceress: A Girl's Guide to the Dungeons & Dragons Game Darcy\'s Place
