an unusual but pleasantly haunting debut 
(ROOT (NP (DT an) (ADJP (ADJP (JJ unusual)) (CC but) (ADJP (RB pleasantly) (JJ haunting))) (NN debut)))
(ROOT (NP (DT ) (ADJP (ADJP (JJ )) (CC ) (ADJP (RB ) (JJ ))) (NN )))