The Code Name series
A sequence of romantic thrillers that includes Code Names Nanny, Princess, Baby, Blondie, & Bikini. Each book features a different heroine (from dog trainers to pastry chefs and then some) and the locales range from desert islands and cruise ships to Los Alamos, but the heroine is always romantically entangled with a Navy SEAL. Fictionwise says "Christina Skye's Code Name books deliver fast-paced thrills with sizzling romance."
The Draycott Abbey series
Another series which features a variety of protagonists linked by Draycott Abbey, a beautiful English abbey. Treachery, ghosts, stories set in the age of chivalry featuring knights and ladies, ex-Royal Marines, and mysteries around every corner...you'll find it all at Draycott Abbey! To Catch a Thief is just one book in this long-running series.
The Knitting Diaries
Macomber, Mallery, & Skye each contributed a story to this uplifting anthology. Her story, "Return to Summer Island", inspired Skye to begin her next series! Knitting patterns are included!
The Summer Island series
Christina Skye has written two books so far in this series, A Home By the Sea and The Accidental Bride. Skye has said she loves her new series because of the "wonderful opportunities to revisit continuing characters and explore the powerful bonds of friendship." Read more about Skye and the Summer Island series in Booklist magazine's article "Story Behind the Story: Christina Skye's The Accidental Bride".