With a lifelong a fascination of all things 'mer,' Dunmore's teen fiction novels were a huge part of my life growing up. The nail-biting months between additions were greatly felt and since the final book was released I have continued to re-read them at least once a year.
I would strongly recommend you purchase a copy of 'INGO.' These books are the perfect mix of fantasy and reality and before you know it you will think you are 'away in Ingo' too.
http://www.amazon.co.uk/s/?ie=UTF8&keywords=ingo+by+helen+dunmore&tag=googhydr-21&index=stripbooks&hvadid=33180446630&hvpos=1t1&hvexid=&hvnetw=g&hvrand=11465040876916339808&hvpone=&hvptwo=&hvqmt=b&hvdev=c&ref=pd_sl_62d39or84x_b