Ranulf by Carole Mortimer

Ranulf Drake has lived secretly in the Scottish Highlands for hundreds of years with his two brothers.

When they learn that a journal has gone missing, in which it is revealed that the Drake brothers are warrior dragon shifters, they know that they have to find the journal, and the man who stole it, before he can expose their secret to the world.
In their search for the journal, and the man who has already killed once to possess it, both of Ranulf’s brothers succeed in meeting and claiming their one true mate.
Now it’s Ranulf’s turn to track down the killer and hopefully take back the journal.
He does so in the hope that he too might meet and claim his own one true mate.