The Homecoming Prince (The Castaway Prince, #3)

Having returned to the continent following Warren's illness, Stephan and Warren are certain they've escaped the notice of spies from Seveihar and are ready to build a new future for themselves. However, their quiet life is shaken once again when they receive a message from Stephan's sister, Nessa. She begs him to return home and help her stand against their older brother, Robert, who is abusing his power by oppressing his subjects and starting an unnecessary war with the neighboring country...