Showing Mission Canyon by Meg Gardiner

Evan Delaney has come to terms with the hit-and-run crash that left her boyfriend, Jesse Blackburn, in a wheelchair and killed his best friend. But when she hears that the driver, Franklin Brand, is back in Santa Barbara, she is determined to help Jesse bring him to book for his crime. Brand was a golden boy at Mako Technologies, a heavyweight cyber-security firm. That's where Evan starts looking, and as she digs deeper, she finds evidence of theft and extortion. Then witnesses to the hit-and-run start dying. It seems that powerful interests are determined to stop Jesse and Evan, once and for all.