The Dragon's Sword

Eryn Stormn, best thief in the business, among other things.
Rollin Greycastle, wizard extraordinaire, at least, in his own mind.
Sephris Alado, sweet, trusting and just overall the nicest half-nymph.
Together they can defeat anything, that is, assuming they don't kill each other on the way.

When Eryn is recruited by a mysterious and wealthy man to steal the ultimate magical sword, she jumps at the chance to finally get the fame and recognition she deserves. Only after she signs the binding contract does she realize she has to work with others.
As the time becomes right to steal the ancient sword, the trio begins to doubt the intentions of their employer, and each other. If only they could get a plan figured out before they all fail, pathetically.

The cover image is not mine, and I don't know whose it is, but it was under a cc licence and free to use or share.