Diamond Fire by Ilona Andrews

Nevada Frida Baylor and Connor Ander Rogan cordially invite you to join their wedding celebration. Summoning, weather manipulation, and other magical activities strictly forbidden.

Catalina Baylor is looking forward to wearing her maid of honor dress and watching her older sister walk down the aisle. Then the wedding planner gets escorted off the premises, the bride’s priceless tiara disappears, and Rogan’s extensive family overruns his mother’s home. Someone is cheating, someone is lying, and someone is plotting murder.
To make this wedding happen, Catalina will have to do the thing she fears most: use her magic. But she’s a Baylor and there’s nothing she wouldn’t do for her sister’s happiness. Nevada will have her fairy tale wedding, even if Catalina has to tear the mansion apart brick by brick to get it done.