Description Two pirates set out on a quest to find a sea monster. But when they catch it, they make an unlikely friendship. The phonemes /ai/ee/igh/ are featured in this title. In Level 4 - Blue books, children build on the letter-sound combinations learned in levels 1 and 2. They learn consonant digraphs (sounds made up of two letters together such as 'ch' or "ll") and long vowel sounds (such as 'igh' or 'ai').